Staffan said:No, it only gets the abilities outlined in the Animal Companions sidebar.
Stormrunner said:The extra Hit Dice gained by an animal companion, familiar, or paladin's mount represent supernatural toughness rather than an increase in size. A paladin's warhorse doesn't increase from Large to Huge size because of its extra HD; likewise a wolf animal companion shouldn't enlarge because of extra HD from being a companion. (Similarly, an _awakened_ wolf cohort with several levels of ranger doesn't get bigger either.)
Legildur said:Yeah, but horses don't have varying sizes listed in their Advancement line of their description like a wolf does.
The question is whether or not the bonus HD (from either Druid or Ranger levels) are animal HD or not. If they are, then the wolf grows, if they aren't, then no.
And class levels are not animal HD, so they wouldn't increase size.
I've seen arguments both ways as to whether or not a wolf grows. Have to wait for Errata I guess......
Legildur said:The question is whether or not the bonus HD (from either Druid or Ranger levels) are animal HD or not. If they are, then the wolf grows, if they aren't, then no.
And class levels are not animal HD, so they wouldn't increase size.
youspoonybard said:No, they don't.
The rules never say "Advance by the MM..."
You just do what it says to do in the Animal Companion Sidebar, which doesn't involve changing your size.