My indoor cat seems to be depressed and bored as he does not want to play with the puppy anymore. He has a good appetite and acts stimulated after a while when I put balls out, toys out and rattle in front of him, but then he goes to the window and looks out like he wishes he were outside. The dog goes outside for potty and my other cat has limited hours outside or she goes nuts. Should I be keeping the other cat inside because of this? Usually I let her outside at night when he is not looking. but at some point he sees her come inside. He can't go out because he runs to the neighbors and eats all sorts of junk food and gets in fights. Please advise. thank you!