Do Animal companions increase size with HD?

[Juggernaut]

This has probably been addressed before but I couldn't find it and am curious about it. Any help is appreciated.


If a Druid has a wolf as an animal companion and he hits 3rd level does the Wolf grow to Large size? According to the MM a 4-6 HD wolf is Large. And with that do they gain the associated amounts of Str, Con and Natural Armor?

Thanks

 

[Egres]

From the Main 3.5 FAQ:

When you add Hit Dice to a druid’s (or ranger’s)
animal companion as the master’s level goes up, does the
animal get any bigger? For instance, when a druid has a
wolf companion, the wolf starts out with the standard 2 Hit
Dice and is size Medium. By the time the druid is 3rd level,
the wolf has 2 bonus Hit Dice. According to the wolf entry
in the Monster Manual, an “advanced” wolf with 4 Hit Dice
would be Large. Is the example companion wolf also
Large?

An animal companion doesn’t get bigger when it adds extra
Hit Dice for the master’s levels. The advancement entries for
creatures, and the rules for advancing monsters, refer to
unusually powerful specimens that are simply tougher (and
perhaps bigger) than normal for their kinds.