Cat suddenly agressive
I have 2 tonkinese cats. A 2 y/o male (neutered) and a 9 mo. female (spayed 2 mo. ago). When we are not at home, the cats are confined to a bathroom, otherwise they destroy the house. This is a large bathroom with an opaque window that has the litter box, food, cat tree, etc. We use the bathroom for no other purpose than for the cats and they understand that is "thier" room. Neither cat has ever been agressive toward me and has always greeted me in a friendly way when I open the door.
For Christmas, we got the cats a new bed - one of those soft sided, open topped basket things which they both appear to love. On Sunday, I went into the bathroom to retrieve a skein of embroidery floss that the cats has stolen and the female was laying in the bed. She hissed at me and when it swooshed my hand at her to tell her "no", she bit and scratched me. Yesterday, when I went into the bathroom to feed her. She was laying in the bed and hissed and growled at me again.
Thinking that perhaps she was being territorial for some reason, I decided to remove the bed from the bathroom last night. When I went in this morning to test my theory, no growling, no hissing (but not exactly friendly either).
Can anyone tell me what is up with this behavior? I hate to take the bed away since both cats love it and seem to share it just fine. I have only ever had male cats before and none have ever acted this way. Is this a female cat thing? Could it have anything to do with her recently being spayed?