Dogs in medieval fantasy worlds

[Scalenex]

I personally just do not see dogs being used as a main household pet like it is in the real world when it comes to a fantasy world. Most of the things that would plague a normal farmer in a fantasy world is not going to be deterred by a dog at all. While the normal animal might actually be intimidated and run from a dog there are a number of creatures that are just so powerful they'll eat the dog eat the farmer and then eat anything else.

At the very least, the dog can be the proverbial canary in the coal mine to warn you of danger coming if it suddenly barks excitedly than is silenced with a yelp.

Otherwise the rationale is "Well the monster is just going to eat me anyway, I don't want to drag an innocent dog into this too."

Can rats be domesticated?

Or more accurately, do rats have the same pack hunting and friendship instincts dogs have that make them such good partners with humans? I know rats can make good pets, but what about good partners?

In a fantasy setting, ANYTHING can be domesticated if the story requires it.

I'm not sure about making domesticated giant rats omnipresent but enough cases have been made expounding on their potential uses that I at least one or two regions or cultures to use them.

Dog Whistles

Silver Whistle: summons a War Dog with barding to faithfully serve its master for 10 turns.

Wooden Whistle: summons a wolf.

Iron Whistle: summons a Hell Hound.

Whistles are either charged or single use items. Although all three summon Lawful creatures, how the creature obeys may be affected by differences along the G-E axis between summoned and summoner.

Clever and punny

Guard Dog:

This statue depicts a large canine patiently waiting. When an event triggers it, usually when a protected space is entered, the statue animates and either barks or attacks. The statue is a 2hd war dog with a stoneskin effect.

Since gargoyles supposedly ward off evil (and I really like the 1990s Gargoyles show) I had the same concept for Gargoyles statues that come to life in temples and wail on foes with their stony fists.

I suppose not every statue guardian needs to look like an ugly gargoyle. One my goddesses as dogs as one of her sacred animals so her temples might have guard dogs.

[DeathbyFlossing]

It’s worth noting that dogs are also labor animals. ‘Turnspit dogs’ would run in a hamster-wheel gizmo attached to meat cooking on a spit, turning the spit to keep the meat cooking evenly. Great Danes were bred to pull carts. Saint Bernards are literally living blankets, bred to track down people lost in the snow and lie on them to warm them with their body heat until they were recovered enough to follow the dog back to the Monestary.

A 1st-level guard with wisdom 10 and 1 rank in Perception/ Spot, Search, and Listen isn’t really a threat to a 3rd level rogue, or a sorcerer who can cast invisibility. Pair him with a dog trained to sniff out intruders - invisible or otherwise - and he becomes a lot more dangerous. A dog could be trained to silently sneak back to the boss and then bark like a madman if it scented orcs or trolls or something. There are a lot of things you can do with dogs.

Also, dog poop is useful for a lot of industrial uses prior to the development of a robust chemical industry. In Victorian England, people actually made a living collecting dog poop and selling it to be used in various processes (I think tanning was one of them, which was part of why tanneries smelled so infamously bad).

[LibraryOgre]

Has anyone talked about the mabari of Ferelden?

[wilphe]

I personally just do not see dogs being used as a main household pet like it is in the real world when it comes to a fantasy world. Most of the things that would plague a normal farmer in a fantasy world is not going to be deterred by a dog at all.

If dogs are irrelevant because things are too dangerous then so are Level 1 Commoners...

[Laserlight]

Dogs are natural sprinters, not long distance travelers.

Are you sure about that? My impression was that dogs / wolves are cursorial hunters, ie even if they don't outsprint their prey, they outlast it. "It doesn't matter if you win the 100 meters, as long as I beat you in the 1000."

Depends on the breed of dog, of course. I don't imagine dachshunds are optimized for long distances.

[Scalenex]

It’s worth noting that dogs are also labor animals. ‘Turnspit dogs’ would run in a hamster-wheel gizmo attached to meat cooking on a spit, turning the spit to keep the meat cooking evenly. Great Danes were bred to pull carts. Saint Bernards are literally living blankets, bred to track down people lost in the snow and lie on them to warm them with their body heat until they were recovered enough to follow the dog back to the Monestary.

I really like this kind of trivia. That's awesome.

A 1st-level guard with wisdom 10 and 1 rank in Perception/ Spot, Search, and Listen isn’t really a threat to a 3rd level rogue, or a sorcerer who can cast invisibility. Pair him with a dog trained to sniff out intruders - invisible or otherwise - and he becomes a lot more dangerous. A dog could be trained to silently sneak back to the boss and then bark like a madman if it scented orcs or trolls or something. There are a lot of things you can do with dogs.

That's a good idea.

Also, dog poop is useful for a lot of industrial uses prior to the development of a robust chemical industry. In Victorian England, people actually made a living collecting dog poop and selling it to be used in various processes (I think tanning was one of them, which was part of why tanneries smelled so infamously bad).

I understand that human poop carries a fair number of diseases and parasites but I don't see how dog poop would be more useful for industry than say the manure of cows, sheep, pigs, and goats. My world has lots of goats and pigs.

Has anyone talked about the mabari of Ferelden?

I have no idea who or what that is.

Are you sure about that? My impression was that dogs / wolves are cursorial hunters, ie even if they don't outsprint their prey, they outlast it. "It doesn't matter if you win the 100 meters, as long as I beat you in the 1000."

That is how Neolithic humans beat their prey too. Though in their case they might track their quarry over 5,000 to 10,000 meters.

Depends on the breed of dog, of course. I don't imagine dachshunds are optimized for long distances.

Dachshunds were bred to hunt rabbits. Their builds let them crawl into burrows.

[Rockphed]

Are you sure about that? My impression was that dogs / wolves are cursorial hunters, ie even if they don't outsprint their prey, they outlast it. "It doesn't matter if you win the 100 meters, as long as I beat you in the 1000."

Depends on the breed of dog, of course. I don't imagine dachshunds are optimized for long distances.

Part of why dogs were domesticated is because they can keep up with humans reasonably well in the long haul. That is rare among creatures with higher top speed than us. That they are have different senses and are social makes them all the more useful.

All the things people have traditionally used dogs for are done in stereotypical fantasy worlds. People raise cattle, sheep, and goats and probably find it useful to have dogs to help with some of that. People have problems with normal rodents. People hunt various animals.

[LibraryOgre]

https://dragonage.fandom.com/wiki/Mabari

Mabari war hounds are a breed of intelligent dogs magically created by the mages of the Tevinter Imperium. When the Tevinter mages brought the mabari to help subdue the local barbarian tribes of Ferelden centuries ago, the dogs defected to the barbarians. Ever since then, Fereldans and their Alamarri ancestors popularized the mabari as attack dogs, status symbols, and lifelong companions.

Basically, Mabari are not quite human-smart, but very intelligent, able to understand language, and communicate pretty eloquently with their limited vocal and physical apparatus (i.e. they can't speak, but they can follow your conversation, let you know if they agree or disagree, and so on). They're so loved in Fereldan that the Fereldans are often called "Dog Lords" by others (at least, in Kirkwall in the Free Marches).

[SandyAndy]

There was a breed of dog that existed solely to turn the rotisserie spit over a fire. The rat terrier was bred to murder the crap out of rats, and they're way better at it than cats are. Retriever breeds are there to catch game birds shot by hunters, hounds are bred to chase game, and pointers to alert hunters to the presence of game. The Newfoundland and Saint Bernard are both bred to rescue full grown men, one from water and one from snow. There are dogs for every different job you can think of. So a lot of things would need a different breed for the different races but a lot of things could be handled by the same breed regardless of the race of the handler.

[brian 333]

Canine Familiar:

Coming in a wide variety of coat patterns and builds, these animals are more than simple companions. They are as intelligent as an average human, and though they cannot speak, they can understand the master's spoken language and can communicate a wide variety of concepts through body language and emotional context.

All Canine Familiars have all of the abilities of a dog and of a familiar. In addition, any Canine Familiar can track via scent as a ranger of the mage's level.

Beginning at third level the Canine Familiar gains a feat, and may choose any non-combat feat available to a Ranger or one from the list below.

Detect Magic as a wizard (-2 to Spellcraft check)

Detect Etheral via scent/tracking check (-4)

Sense Hostile Motive of beings which interact with its master as the skill at one rank per 2 levels of the master

Find Master. If separated from its master it can, even in the absence of any means of tracking, know the general direction and distance it must travel to reunite with its master

Find Home. As above, but it will go to its master's last residence.

Flank Attack any being which is attacking its master for an additional d6 damage per 5 levels of its master. This damage stacks with any other damage type.

At Level 6 the Canine Familiar gains access to the Ranger's combat feats, and the following list.

+1 Bite. This is an Enhancement Bonus.

Detect Shadow via scent/tracking check

Spellcraft at one rank per two arcane levels of the master. This skill caps at the master's skill level -2

At level 12 the Canine Familiar gains access to the following feats.

+2 Bite

Cast Cantrip. A chosen cantrip can be cast once per day as if by a Sorceror. This feat may be chosen multiple times to allow multiple castings of the same cantrip or to allow the casting of another cantrip.

At 18th level the Canine Familiar gains access to the following list.

+3 bite

Planar Adaptability. This ability allows the familiar to travel to exotic planes and adapt so that environmental conditions do not harm it. This is not to be confused with elemental damage reduction; it applies only to the natural effects of a plane. While on the Elemental Plane of Fire the familiar with this feat takes no damage from the environment, but does take fire damage from attacks. The same familiar would burn if it tried to stand in a campfire.

[Lemmy]

So... Two reasons not to use giant rats:

- They are rodents. Which means they have to keep using their teeth. IRL, normal rats cost tens of thousands of dollars in infrastructure damage. Imagine what large rats could do... A single group of strays could cause massive damage.

- AFAIK they form social groups, but not hierarchies. So they don't really have that "follow the leader" instinct for breeders to exploit.

- Short lives. Rats have very short life spams. Which may limit how much use of their intelligence and training one can make... Even if a giant rat lives twice as long.

- They wouldn't be as good for hunting and protection. Rats eat meat, but they aren't dedicated hunters. Their primary instinct would be to avoid/run from other animals and intruders.

Now... You can obviously change these things, but then you're just reinventing dogs.

[Lvl 2 Expert]

Dwarves and other underground dwellers may have specially bred dogs or other animals for hunting tunnel vermin, or just tunneling animals you want to eat. Real life wiener dogs were bred for chasing foxes out of their dens. The stubby legs are essentially a way to get a bigger, more powerful animal down to the size where they can just squeeze into the fox tunnels. Depending on how many rats, foxes, weasels, badgers, dire moles and feral drow they have to deal with down there they may keep similar animals, bred specifically to match the size of all the important pest/prey species. Weasels may form a particularly interesting creature to breed a predator for, because they are essentially already evolved to fit the same concept. In fact, maybe for all of these just start from domesticated weasels rather than dogs. Special breeding may also be done to obtain animals that get along with donkeys, and don't freak out when they stumble upon one hauling a load of mined goods around.

[Martin Greywolf]

Historically speaking, by the time we get to even early medieval times, we see the variety of dog breeds that is effectively the same as the modern one is. Pugs and shiba inus pre-date Charlemagne.

Seriously, check these out:

Spoiler: Is that... an authentic medieval female archer? 1325

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Spoiler: That's a big one, ~80 cm at the shoulder, ~1410

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Spoiler: Two tons of rage in a two-kilo body, ~1380

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Spoiler: Pretty big guard dogs, ~1375

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Spoiler: In case you thought those "handbag dog" breeds are a modern thing, 1316

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It's the far left and far right guys, look at their hands

Spoiler: They let this one into the bedroom, ~1350

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Spoiler: A hunting dog breed small enough to get into rabbit burrows, ~1310

Show

Spoiler: A good boy with a floofy tail, ~1285

Show

Spoiler: A sad labrador-like boy, 1250

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Spoiler: Your typical hunting dog, ~1230

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Spoiler: Looks like a rottweiler-like breed, ~820

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So yeah, you can absolutely give a Yorkie to your dwarven king and be pretty authentic. Okay, not really, Yorkie is a 17-18th century breed, but you know what isn't?

Spoiler

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Such medieval, much king, very dworf

[brian 333]

The Duke's Dogs

The estate of the Duke of Barentithe was guarded by his pack of hounds which were famously ferocious and unrelenting once they were in a chase. As they died they were made immortal through his magic.

The first was Luci, the foremother of most of his hounds. It was said that she never returned to the kennels until she had caught her prey.

Her likeness was carved in stone and her spirit was used to create a hound-golem which is bound to obey the heir of Barentia. Once commanded she will seek out and slay any target and return with it or a piece of it which she will drop at the base of her pedestal before she resumes her usual statue-like pose.

Sounder was famous for his baying while on the chase. Now he patrols the estate by night as a ghost, sounding a warning when he encounters anyone who is not supposed to be there.

Every third round he can howl as his attack action resulting in a Fear Spell effect to any who hear it, excepting the heirs, servants, and retainers who are allowed to be on the estate. His bite does not inflict physical wounds, but instead inflicts 1d3 negative energy damage.

The pack alpha was called Rex, and he was the leader of every hound on the estate. Loyal to the bone, even after death he answered his master's call. Rising from his grave, the skeletal pack leader summons 3d6 other skeletal hounds to answer the call and obey the commands of the heir of Barentithe.

Rex is a 4HD skeleton whose bite inflicts d12 damage. 1 out of 4 of the skeletal hounds which answer his call will be 3HD skeletons which inflict d8 damage, 1 of 2 will be 2HD and inflict d6 damage with each bite, and the remaining 1 of 4 will be 1HD with a d4 bite.

They all have double the movement of a normal humanoid skeleton. Other than as mentioned above they have the strengths and vulnerabilities of normal skeletons. Summoning Rex requires d3 rounds, and his pack will arrive over the next four rounds.

When destroyed the skeletal hounds turn to dust, but after one full cycle of the moon a destroyed Rex can reform. Rex can otherwise be summoned once per 24 hours.

Dianna was a fiercely loyal pet of the Duke's daughter. She now exists as a stuffed exhibit in the third floor hallway.

When the family quarters of the estate are entered, Dianna animates as a flesh golem. She will capture burglars and kill assassins. Essentially, she will do to the intruder what he intends to do to the household. As an example, one would-be thief was chased out of the mansion after Dianna had shredded his clothing and removed everything valuable on his person.

[Quizatzhaderac]

Regarding monster detection.

Commoners would use dogs to tell that there's a jabberwocky in the woods, and then just avoid a few square miles until they hire an adventurer to deal with it.

In a second-to-worst case scenario, a commoner might run while the monster is fighting their dog.

Adventurers have to sleep outside, which is dangerous enough in the real world. Many dogs are light sleepers and can by woken up by scent alone or sounds people can't hear. A realistic dog wouldn't take a shift (they need more sleep than humans and it would be difficult to train them to stay awake when alone and idle).


Regarding hunting/ fighting.

Dogs have been traditionally used to oppose bears and lions, so it's not out of the question that they'd help deal with lesser monsters (that commoners might survive). But outside of bloodsport, dogs wouldn't be left alone to fight. People would be there with bows or spears having the dogs basically tanking the target while a group of armed people actually finish it.

Would gnomes and halflings breed smaller dogs or would they like to have huge dogs?

Riding dogs would have to be big.

Working dogs would have to be sized to match their work. Probably used for stuff that is difficult for halflings to do with their small size (i.e. chase sheep around).

Pure companion animals are a modern thing, and still largely shaped by what they were once used for. I'd give gnomes birds that can also sing and carry messages. I'd give halfling rabbits that can also be shaved for wool.

What kind of dogs would dwarves keep?

Underground is not a good place for dogs.

What kind of dogs would orcs keep?

What does an orc's domestic situation look like? Do they farm, herd, hunt/gather? Are their diets like humans? or are they obligate carnivores?

Would dogs be able to bred to do anything fantasy like be trained to "bark if you smell magic"

Dogs can (at least in fiction) detect aggression itself. Even if a dog (and it's owner, for that matter) has no idea what a wizard is doing, the dog will be able to know that it tried to do something to it's master.

Rats

I would plain make up a fantasy rat species that's more domestic. Civil rats can be easily identified by thier blue fur.

Civil rats aren't owned by a specific person, but live alongside a community or people.

Much more fastidious than wild rats, they leave their waste in specific places and sharpen their teeth on specific things. They're intolerant of wild rats, mice, roaches, and some other pests.

They will cuddle kittens, puppies, babies and such, which socializes other domestic animals to their presence.

People living alongside civil rats will often intentionally leave out (or event create) table scraps for the civil rats.

[Scalenex]

So a while back I was pondering what to make my fantasy humans and demi-humans look like.

Humans, elves, dwarves are gnomes are species. The culture someone was raised in determines ethnicity, but I hadn't touched race.

I created four fictional races, Earthy, Fiery, Watery, and Airy.

Each race has a stereotypical hair color and type, skin tone, eye color range, body build, etc. There are cultural stereotypes, both good and bad for the four races.

And the vast majority of people in my world are mixed so they will embody traits from two or more elements.

40% of a child's elemental makeup comes from their mother, 40% comes from their father, and 20% comes from the landscape near where the child was conceived and where the mother dwelled while pregnant.

Overtime, populations that live far inland become more earthy, populations that live near the coasts become more watery, populations that live in cold environments become more airy and populations that live in warm environments gradually become more fiery.

It occurred to me that if this elemental genetics affects humans, why it wouldn't it affect animals?

You can artificially breed dogs a lot easier and with fewer ethical concerns than artificially breeding humans.

I got a full World Anvil article here, but the core points are below.


Earthy dogs tend to be large and strong if a bit slow in both senses of the word. They tend to have brown, dusty, roan, or black fur.

Fiery dogs are very spirited and aggressive and have great endurance. They tend to have reddish orangish fur. As they get older, their fur is streaked with dark greys.

Watery dogs are intelligent and inquisitive and are naturally strong swimmers. They tend to have light blue or vaguely greenish fur.

Airy dogs are very fast but they are geared for sprinting not long term endurance. They are a bit flighty and have low attention spans. They tend to have white, golden, or silvery coats.


You want a dog to pull a heavy sled a long distance, go with a fiery/earthy mix. If speed is important, cross breed with an airy dog though you lose a bit of raw power when you do that.

You want a hunting dog to find the birds you shot down? A watery dog with a pinch of earth will probably get the job done.

I figure a dog balanced between the four elements would be pretty good at sensing the supernatural. Because they themselves are metaphysically balanced, they can sense when things are out of balance.

[Squire Doodad]

You want a hunting dog to find the birds you shot down? A watery dog with a pinch of earth will probably get the job done.

Or you can get an air dog and have it shoot down the birds by itself

[EdokTheTwitch]

From what I see, a lot of people have mentioned how real dogs would fare in a fantasy setting, so we can skip that aspect for now.

Concerning breeds that would turn up, we can start from the existing ones: We have the dogs halflings train as battle mounts, and blink dogs that are able to bamf around at will. From there, we can imagine a slew of magically-modified beasties (effects are based in D&D terminology, but applicable anywhere. The locations are made up):

Ironspire Howlers: A hunting dog favored by dwarves and farming communities, this breed prefers to hunt in packs. When it detects prey, it lets out a howl that both alerts the hunting party and paralyzes the target. When fighting, it benefits from flanking with others of its kind, gaining a bonus to damage similar to a rogue's sneak attack. Due to being originally bred by the dwarves of Ironspire, it possesses excellent darkvision as well.

Spellhound: This unique breed of dogs came about in frontier towns held by the Arcane Alliance. Feeling threatened by the local fauna, the mages of the alliance breed war dogs to be exceptionally receptive to magic. As a result, when threatened, these dogs instinctively cast seven spells on themselves: Enlarge, Bull's Strength, Bear's Endurance, Cat's Grace, Owl's Wisdom, Eagle's Splendor, and Fox's Cunning. This rapidly turns them into a highly intelligent fighter, able to defend their masters more efficiently.

Gleamfang: Faced with frequent Drow invasions, the high elves of the Moonglade imbued their dogs with the energy of sunlight. While in combat, these dogs are known to radiate a light effect, no stronger than the standard light spell. However, this light is treated as sunlight for the purposes of light sensitivity.

Just three examples of the top of my head, but I'm sure there's lots others could come up with as well.

[Giggling Ghast]

https://dragonage.fandom.com/wiki/Mabari

Basically, Mabari are not quite human-smart, but very intelligent, able to understand language, and communicate pretty eloquently with their limited vocal and physical apparatus (i.e. they can't speak, but they can follow your conversation, let you know if they agree or disagree, and so on). They're so loved in Ferelden that the Fereldans are often called "Dog Lords" by others (at least, in Kirkwall in the Free Marches).

It's worth noting that Mabari are implicitly magical creatures, having been bred long ago by the mages of Tevinter.

[Squire Doodad]

Gleamfang: Faced with frequent Drow invasions, the high elves of the Moonglade imbued their dogs with the energy of sunlight. While in combat, these dogs are known to radiate a light effect, no stronger than the standard light spell. However, this light is treated as sunlight for the purposes of light sensitivity.

Just three examples of the top of my head, but I'm sure there's lots others could come up with as well.

One thing to note is that Gleamfangs would be able to basically insta-kill any vampire they can pin down. Are you specifically aiming for that, or was this an accident?

[brian 333]

Unintended side effect?

I would say that three successful rounds in the grasp would be needed, treating the vampire as if it were exposed to sunlight. It can try to break free, but its vampire powers don't work.

As an added bonus I'd rule that though the presence of such dogs does not cause harm to vampires, a bite bypasses the vampire's DR.

INSPIRED BY THE COMIC AND THIS POST:

Silver Fangs

A character with Healing skill can make a silver plating which when applied to teeth grants the dog or other creature the benefits of silver weaponry when biting.

Getting the dog to actually attack the lycanthrope or infernal is another issue!

[Squire Doodad]

Unintended side effect?

I would say that three successful rounds in the grasp would be needed, treating the vampire as if it were exposed to sunlight. It can try to break free, but its vampire powers don't work.

As an added bonus I'd rule that though the presence of such dogs does not cause harm to vampires, a bite bypasses the vampire's DR.

INSPIRED BY THE COMIC AND THIS POST:

Silver Fangs

A character with Healing skill can make a silver plating which when applied to teeth grants the dog or other creature the benefits of silver weaponry when biting.

Getting the dog to actually attack the lycanthrope or infernal is another issue!

Interesting idea!

Gleamfangs being able to pierce DR no matter what (or having them count as silver) would be nice, makes them anti-vampire/werebeast/etc without making them be able to just steamroll a fight with a vampire with some grappling help.

[EdokTheTwitch]

One thing to note is that Gleamfangs would be able to basically insta-kill any vampire they can pin down. Are you specifically aiming for that, or was this an accident?

Oddly enough, both. I was trying to create effects that would have unintended consequences, but I was having problems coming up with any. So, this is exactly what I was aiming for. From a simple drow deterrent, it evolved into a dog favored by monster slayers. I love it!


Side note: would there be a market for a supplement along the lines of "Critters of Faerun"?

I'm coming up with a sea of ideas atm :D

[sandmote]

Concerning breeds that would turn up, we can start from the existing ones: We have the dogs halflings train as battle mounts, and blink dogs that are able to bamf around at will. From there, we can imagine a slew of magically-modified beasties (effects are based in D&D terminology, but applicable anywhere. The locations are made up):

For completeness, I'd like to mention the Yeth Hound and Shadow Mastiff as existing examples.

Additional suggestions that might work:

• A dog with earth glide (or a weaker equivalent), able to navigate the dens of small animals while also fighting larger creatures being much larger itself.
• A dog with limited flight or distinguished climbing ability, living in the mountains. Likely used by d&d goliath or an setting equivalent that travels through incredibly rough terrain which would require mundane dogs to be carried.
• A rare mage hunting breed, with resistance to magical effects.
• A dog that can't teleport as quickly as a blink dog, but is able to teleport itself and other though tunnels and summon fresh air, functioning as a rescue dog in the underdark.
• A breed from the plane of fire, used by firefighters everywhere else.

[brian 333]

Sea Dogs are prized by pirates and nautical explorers. When immersed in salt water their hindquarters morph into those of a seal. They eat what dogs eat, but prefer slightly rotten fish, which takes doggy-breath to a whole new level.

[Catullus64]

What I would do if I wanted fantasy dogs in my world would be to have them be completely identical to mundane dogs, except for one fantastical trait that all dogs have. Here's the key part: it's not considered unusual or fantastical by the people in the world; for them, that's just what a dog is; dogs wag their tails, bark at squirrels, and occasionally extend their four-foot long prehensile tongues to detect lies. Normal dog stuff.

A particularly evocative trait would be to borrow from Huan of the Silmarillion. He can speak, but he is fated to do so only three times in his life. To do that for all fantasy dogs, I would have the number of times that a dog can speak be a valued trait of different breeds; most dogs can only speak once, and only the noblest breeds can speak thrice or more.

[sandmote]

What I would do if I wanted fantasy dogs in my world would be to have them be completely identical to mundane dogs, except for one fantastical trait that all dogs have. Here's the key part: it's not considered unusual or fantastical by the people in the world; for them, that's just what a dog is; dogs wag their tails, bark at squirrels, and occasionally extend their four-foot long prehensile tongues to detect lies. Normal dog stuff.

I'd have a section that very clearly lays this out. If the characters are just using the word "dog," the listener/reader/player/whatever is likely to assume mundane dogs. I'd have a scene that lays this out clearly when dogs show up, either in character or as an aside by the author. Please note I image such an aside to read like it was written by Terry Pratchett: "The dog was completely mundane: she liked to wag her tail, chase squirrels, and could lick you with her four foot tongue to discern if you're lying. Aside from the large reddish spots on her ears and muzzle, she would be completely indistinguishable from any other stray in the village."

[brian 333]

Canine ears are thought to hear better than any other, and thus dogs are immune to the effects of a Silence spell.

Dogs know all languages and their ears are used as material components for Comprehend Languages spells.

A dog heart is the primary component in a potion of Endurance. An unfortunate side effect is that users of such potions become single-minded while under its influence requiring a Will save to stop before an attempted task is completed.

[Squire Doodad]

Sea Dogs are prized by pirates and nautical explorers. When immersed in salt water their hindquarters morph into those of a seal. They eat what dogs eat, but prefer slightly rotten fish, which takes doggy-breath to a whole new level.

"This is it, Fluffbeard. You've cheated at cards for the last time. I'll give you just one move before I cut you to shreds."
"Well, good news is, I got no weapons. The bad news is, I got a pupper in me boot. Say ahh, Princess."
* puts dog in front of the other guy and opens its mouth *
"What is that supposed to- OH GOD WHY DO I STILL BREATHE"

[Resileaf]

Dogs in real life are bred for their traits, and as such any magical creature that can spread its genes to anything alive would be very valued to give traits to dogs.

Celestial and fiendish dogs would therefore be highly valued to keep their genes going strong down their line. Dragons are also known for being able to have offspring with anything. Dragon-blooded dogs would also be highly prized. And I'm sure there are plenty of other templates that could be applied that would be favorable to keep and increase for fantasy breeders. Heck, I'd expect cross-breeding between dog templates to see what genes can be combined.