Sorry to burst your bubble, but all pets are now grouped into 3 different groups. Ferocity, Tenacity and Cunning. All pets in cunning do the same damage as all other pets in the same group. So Chimaeras, being exotic, still do the same damage as bats. Unless of course you are talking about their racial abilties, which differ from beast to beast. And in this case, a Chimaera does less damage with its' racial than a Wind Serpent, which is a non-exotic beast.
last i checked a core hound was an exotic pet and grouped under the ferocity tree.