My parents have a running battle going on. One protagonist is a 7 yr old neutered tom, been with them from kittenhood. 3 months ago they accepted as an emergency resue a 3 yr old spayed female. They just don't like each other and spit and fight apart from when being fed, when they are too busy to notice each other.
Both go outside, using a cat flap, but they cannot tolerate being in the same room. The boy is much bigger, but the girl is more agressive.
We'd be etrnally grateful for any advice.
Anyone got any ideas?