Hi folks, I'm really hoping someone has some experience with this sort of thing... I have a 12 year old cat, and her two 10 year old daughters, all spayed. They have been spayed for 8-9 years. Since her spaying, the mother cat has been quite miserable. While she loves human (my) attention, she does not tolerate the other two anywhere near her, and hisses at them when they are close. She attracts the neighborhood cats, and they have their singing standoffs. From what I can tell, the cats that come and visit are toms. Sierra does not have sex with these cats, nor does she appear to go into heat, but she seems to defend her territory, and also marks it by spraying. I believe that this isn't a typical behavior of altered female cats. The other two don't spray at all, don't seem to attract the guys, and are quite personable, and at least tolerant of each other. I think it could be due to a botched (incomplete) spay, but I'm wondering what other options, or possibly solutions, might be. She seems very hormonal and a little confused with life, and I feel sorry for her. I'm hoping to find out what I can before a vet visit, as she is very healthy otherwise. TIA for your feedback!