When you start to have alot of pets in the stable , it gets annoying when looking for your specific pet.

There should be a release button which would release the pet from your stable so it no longer exists anymore.
or
You could trade a level 20+ pet for gold in auction or trade it for other pets.

You should be able to choose what npc your pet attacks or give the pet more 1st person abilities e.g spells which will use up pet mana etc

WHO AGREES!?