[RPG] Do Druid animal companions go up in size with HD and gain size-based stat increases


I have an animal companion which has just gained its 5th HD. On page 291 of Monster Manual 1, the Improving Monsters section says that an increase in Size also changes stats.

Do animal companions (e.g. from Druid or the Wild Cohort feat) increase in size based on their HD, and if so, do they also gain the stat adjustments from MM1 p291?

Best Answer

No, in D&D 3.5, animal companions do not grow in size due to bonus HD. It does not clearly state this in the core rules but is explicitly stated in a Skip Williams rules article on animals on Wizards's site.

Like many things, this was improved in Pathfinder, where specific size increases are defined per animal companion type explicitly in the rules.