Old cat does not get along with new cat.?
We took in my Mom's friend's cat (Kirby, Male) after she had to move. We already had a cat (Penny, Female) that was around the same age. My mom didn't bother to do research on how to introduce them properly and they do not get along. Whenever Kirby see's Penny, he will chase after her and it will end up in a cat fight. It seems like Kirby is just doing it to play but Penny gets defensive, hissing and hew tail hair poofing out. Currently, Penny does not leave the two "safe" rooms that we made off limits to Kirby. Kirby has "taken over" the whole second floor and most of downstairs. Is there anything what can be done about Kirby's behavior or any techniques that will help them get along?
Any help is appreciated.
They are both spayed and Neutered. They are both close to 7 years old.
I'm in high school so I live in the same house as my mom who took the cat in. I didn't think it would be a good idea to bring Kirby into the house because I didn't think penny would be happy sharing her space with another cat.