There is no enhancements for pets. There was once and Adventurer's Pet Enhancement but that is now rare.
pet shoppe
you need to have necromancer class
oicu821
You can get it if you are member. Some of them is in the pet shop in battleon town.
Adventure Quest - Aria's Shop on the left side Adventure Quest Worlds - Aria's Shop on the left (Membership only)
you can get the vorpal bunny armour of the vorpal bunny pet
There is no non member pet but you can buy parrot cape and that looks like pet but its cape
if you are talking about nulgath's betrayal blades, you can get them from different quests from nulgath, who is in tercessuinotlim.
She is located in Aria's Pet Shop in Battleon town (/join battleontown), to the left.
you can not get this pet any more it was purchased from pet shoppe in 2008 during frostvale
you cant get one at all but if you meen the dark wolf you get it from the willow creek quests
buy it from a pet store