I'll 2nd the catnip. It doesn't have to be prescribed by the vet. It grows wild all over here. Anyway, it mellows some of mine and produces a wild effect on some. I just cut pieces in 8-10 in pieces and place it around. In an hour I have to vacuum but have very happy cats. When I didn't have the plants, I would put it on the kitchen floor and they would roll all over it, throw their paws over it to say mine, mine, MINE!!! It makes them very happy. They'll not only play in it but eat it also. If you do try it let us know details!