Our cats go nutso over this thing! We had to get several just to keep them happy, and from being jerks. I mean, why do you have to beat up on each other? Why not just take turns and live in peace and harmony. That's the kind of life I want for my cats. You should two. What I'm saying is, that if you have more than one cat, do the right thing. No need to cause angst in your happy home. Buy two. Or three. Or Ten. Either way, we all win.