I know have 3. Good thing my townhome is fairly large...the hardest thing for me was having to walk all 3 since I don't have a fenced in yard. Diva's pup, Duchess, is now 12 weeks old and goes with us now & man, at first I thought I was going to have to do Diva & Foxxy..then walk Duchess later...but all that is in the past...we all walk 3 times a day and it is a joy everyone's gotten the hang of it...I defnitely possibly want 1 more...I guess it's like kids, once you go past 2, it's really not that much of a difference once everyone's settled!