Animal Companion

I’ve recently taken the animal companion perk. I played for a few hours the other night and was happily able to summon and dismiss two pets (the two that i had tamed thus far.)

I since have dropped those two off at the stable master in stormwind and went in search of 2 different pets to experiment. I tamed 2 new animals but am in able to have them both summoned at the same time.

Am i missing something?

Animal companion talent will always choose the pet in your first stable slot as the 2nd pet