Hi guys!
Guess what happens if your friend gives you 4 animals, so you are full, can't even see one because you have no companion equipped and you purchase one from the petropolis!~?
That's right! You can purchase one with a full inventory of pets.
I don't advise it though, as you will now no longer be able to trade with anyone!
Or trade the pets back. Which will make you look like a real jerk.
OH! And you can't equip either of the two pets you can't see, if you title your new pets name later in the alphabet than your other pets. Don't name them Zeta guys!