Aw, I'm sorry to hear that. Yes, definitely time for him to go find better owners. We had this problem at our previous house, which had french doors opening out to the back yard. A neighbor refused to keep his unneutered male cat inside and the cat would throw himself at the glass doors at our spayed indoor female cat, yowling that piercing cat fight yowl and banging his whole body against the glass (it's a surprisingly loud sound, especially in the middle of the night!) And our poor cat was always on edge and agitated, yowling and throwing herself at the glass, too. Our bedroom was on the same floor and it was hard to sleep at night. We put heavy curtains on the glass doors, but our cat would just push through them to look out. We tried spraying deterrent on the outside of the door. Running out and chasing the other cat away. Nothing helped. Ultimately it wasn't our responsibility to have to bend over backwards to deal with this problem cat. Lucky for us, we moved soon after, but if we'd stayed longer, I would've had to trap that cat. This is completely unacceptable, and if the owner refuses to solve the problem, then nobody can blame you for taking charge yourself.Well kitty is going to the pound, I’ve had enough. He tried to follow me inside this morning and my own cat, Willow, had an episode of redirected aggression on my foot as I was trying to slip inside. I’m currently in a doctor’s waiting room.So, super fun morning and my coworkers are having to deal with a busy day without me there.