Emmett and Rocket

I'm fostering a cat with the chance to adopt him if I want to. I thought things were well, but I really don't think Emmett is happy with the arrangement. One of them has started peeing in the bath tub and I think its Emmett. I feel kind of bad but I'm going to give up the new guy, but Emmett is my main concern. I think I'm a one cat person and I think Emmett is just a loner my nature.

I'll move this over to the behaviour forum because i'm sure someone can help.

Have you tried plugging a Feliway diffuser in?.

Please don't give up yet. It's natural that Emmett will feel his space has been invaded because Rosie did when i brought Sophie home, but she came around in the end