We adopted a rescue cat nearly two months ago. He's a gorgeous boy although younger than the rescue centre claimed according to our vet. He is apparently 2 years old. We already had a cat, a 7 year old female.
After initially introducing them too fast and them fighting we've kept them very separate. She spends her time upstairs and him downstairs. However, she's terrified of him. We've been trying scent swapping. That doesn't seem to bother either of them in any helpful way at all. We've been locking him up to allow her time downstairs but we are having to force her to stay downstairs as she's so freaked out she tries to run and hide back upstairs whenever she gets the chance.
We've bought a stairgate in an attempt to stop him getting upstairs and forcing her to stay downstairs when we bring her down. Well, she's basically trying to eat her way through it to get back upstairs and when he's not being watched he's jumping over it to get upstairs.
We originally thought he was just interested in getting upstairs as its an unknown place for him. We then thought he wanted to push his luck and eat our resident cats food (since she's now too scared to eat downstairs) but he's actually managed to attack her twice as I've not always got to him in time. I had hoped with supervised time in the same room, he'd calm down. They've been taking meds from the vets for nearly a month to try and calm them both down, but last night he attacked her and drew blood. When I went to calm her down I had to remove some of the new boys broken claws from her fur.
We really don't want to have to return him to the rescue centre but don't know what else to do. She won't stand up for herself so he's completely in control. I think he's adopting some bullying behaviour too - sits in areas that would prevent her from coming downstairs etc. she literally won't leave the room unless we carry her downstairs and no longer goes outside. We got him because we thought she was lonely after our older cat died but we're making her life miserable.
I don't know whether we can make things better. Any advice?