My kitty used to do the yowling too. You have to ignore it. I know it is horrible to endure, but when it brings them attention they are rewarded. But here's what I would do. I would call the my kitty to me. He knows his name and comes when called. I would pet him and love on him and then he would calm down and go away and quit yowling. Don't go to them, make them come in a different room and come to you. You are the boss of him. Also they can sense if you are anxious or upset and that makes them act up. So it is very important for you to be calm. Running around after them yelling with a squirt gun will not work. At least in this situation from my experience.My kitty seems to be getting worse and worse, he is now yowling CONSTANTLY, and the howls are violent And its almost as if he's screaming, and it appears to be for no reason at all because he has food and water. I'm very concerned and I'm just not sure if it's because he's not neutered anymore. :/