I have three dogs a papillion a yorkie mix and a chihuahua puppy I just recently got from my sister. My papillion is very jealous and demands attention he's spoiled my yorkie she's very active and hyper I thought adding a pup to the mix would be a bad idea because the other two especially my papillion would hate the idea when the pup was brought home at first there was growling and they both avoided the puppy like it had the plague but now they've decided to add him to their little pack they both wrestle and play with him. There's no harm in trying for three its a bit of work but if you have the energy and time to put into three dogs then go for it. So far I love having three fur babies