Dragons with cleric spell access?

[Darkweave31]

Several dragons are listed as being able to cast spells from the cleric list or cleric domain lists as arcane spells. How does this work with spells known?

Does the dragon have to pick these spells for its spells known or does it know all the cleric/domain spells in addition to its normal sorcerer spells known?

[Dusk Eclipse]

I am not sure, but I've always played them as having to pick them as spell known; IIRC most dragons don't get the full cleric/druid list, but only a few domains.

[Fouredged Sword]

It can select from the standard cleric list as well as the sorc/wis list when picking spells for it's spells known.

[Darkweave31]

That sounds right, just wanted a second opinion. Thanks!