I am experiencing a similar problem with a 1 year old male neutered cat we brought home from a shelter. Our "existing" cat recently lost her brother, so we got a new cat thinking it would shake her out of her depression.
It is shaking her out too much. He attacks her and she is always...
We recently lost our 3 1/2 y/o male to a rare heart condition. He was very close to his sister, who we still have. After he died, she went into major depression...so we got a 1 y/o neutered shelter cat. We introduced them slowly and it seemed to be going ok.
But, he is now attacking her and...