Awaken and bonuses

[mekka2000]

My question is simple, the spell "awaken" says that "An awakened animal gets 3d6 Intelligence, +1d3 Charisma, and +2 HD"

As there's +2 HD, do we need to recalculate saves, BAB, skills points or not ?
Is it only "more health" ou "the animal takes 2 levels" ?

Thanks !

[The Sideromancer]

The animal takes 2 levels, but they're levels in animal (racial HD).

[mekka2000]

thanks !

[Ascalaphus]

It gains animal racial HD, but yes, that does mean you recalculate stuff.