you will have to search in cq_itemtype for the exact ID of the pet (will start out with 107[last 4 didgets])
go into cq_monster type and look up the last 5 digets of that number, you will see the look face of the pet.
in c3/monster you will have to put a new file mesh file in
and in c3/texture you will have to put a texture in that matches the mesh.