Quote Originally Posted by Soranar View Post
There are exceptions.

Basic familiars have no HD, thus no feats.

But some improved familiars do have HD. For example, the dragon familiar feat gives you access to various wyrmlings.

The gold dragon wyrmling starts with 8 racial HD so it can choose 3 feats and advance its skills, independantly of yours, up to that point. However it can never progress beyond that level.

The homonculus can also be advanced (which is the whole point of having one in the first place as they can't talk, thus they can't use wands).
As mentioned earlier in the thread, they get the base abilities for the creature (which includes HD and related stuff). They just don't gain extras for being familiars.