I have two cats, two sisters, that always lived together. When they were kittens, we lived in a big house with a garden in which they could play or hunt. But I moved to a smaller appartment with both of them a few years ago. They are now eleven years old.
At the beggining everything was okay, but now they fight each other often. One of them seem to be very stressed out. I tried using attractive scents that the vet gave me, but it doesn't seem to work very well. I can't separate them either : I live in a rather small appartment and it would be plain cruel to limit one of them to a small room.
What can I do to make them relax and accept each other ?