it's a fair point
I think people are assuming the DServ will replace not add, but the tooltip is ambiguous.
i think it is highly unlikely that we will get two Pets. All pet-classes can only only have 1 Pet at a time + any number of minions.
There is no way in the interface to control two pets (for example how would you macro something like /petattack ?) You always only get 1 Pet.