Technical question about damage

[Malphegor]

Animal Growth would be another one. The damage difference is negligible at regular size, but would show up on a larger version of the creature.

That's a weird thing I never noticed - is there really no spell that lets you increase the size of a Dragon? Enlarge Person for Humanoids, Animal Growth for Animals, but nothing for the other creature types.

I suspect this was an intentional design choice so the size of a dragon is usually indicative of its power for its colour. If a wyrmling dragon can embiggen itself to the size of a colossal great wyrm it causes an extra layer of complexity identifying them…

and also is 100% something a dragon would do. Fear me, for I am mighty, my tiny baby wings will black out the sun!