Animal Companions and Size

[AnthonyJ]

Do animal companions increase in size due to increased hit dice? i.e. are the extra hit dice for an animal companion a specialized bonus, or are they just extra hit dice?

 

[jgsugden]

Andy Collins has stated that animal companions do not increase in size, though this is not clear from the books. They do gain attributes, feats and skills when advancing in hit dice, but not size.

 

[AnthonyJ]

Thank you. I was inclined to think that was the case (a Large wolf at level 3 would be pretty impressive) but the books were not clear.