We rescued a cat last fall and in the process of having dental done on him, we learned he is FIV positive. I've been attempting to add him to our household of 2 adults and 2 other cats (1 male, 1 female) since he won't be able to be an outside cat anymore. We initially thought it was him peeing, and separated him from the others. After a urinalysis came back negative for infection or crystals, we determined it was our other male. Boy was he peeing. Everywhere! My draperies, baseboard, furniture, etc. In every room of the house! All vertical. This new rescue is very mild mannered, very needy as far as cuddles and petting. It seemed as if they got along, eating together and even lounging on the sofa together. I can't understand why the other would view him as a threat, but this is definitely territorial marking. (BTW all are neutered.) New cat is lonely being closed up in studio (12X22) and wants to join the group and I feel terrible for him. I'm trying to spend as much time with him as possible but it isn't enough. With Mason (new guy, maybe 5-8 yrs) locked in, the peeing by Herbie (our 10 year old) appears to have ceased. My husband is fed up and wants Mason out, but I'm desperate to find a solution. I appreciate any feedback.
