Our limit would be 4 if it was up to me, but my husband made me sign a contract agreeing to not having any more pets for 10 years! It was the only way to bring home Ruby. We have three now, but with 2 fish tanks, 2 cats, 2 cockatiels, and a rabbit, along with obedience training and work, I think 3 is our max (but I'm always ready for a 4th!)