Thank you for there is one other cat in this house and they are playing constantly. He doesn't bother her,but there are always cats and dogs around my house so maybe that is why he is doing this. Judas says thank you for his family will work harder trying to keep the other animals away from his home.
Thank you very much for your help, it as been a trying week here but we are getting through it.Judas thanks you now that his Mama and his Nana understand what is going on with him.
Marking can happen with neuters and even spays as well as non-neutered kitties. It is all about marking his territory to say "I am here!!!" (At least he *is* neutered, you don't want the horrible scent of a non-neutered male cat's spray.)
All you can do is to try to remove or change what it is that makes him territorial. Other cats outside? Keep him inside. Too many other cats around, or a dog? Maybe consider moving if you're in a rental.
Well, some things I have read indicates that your boy was neutered too late to prevent the spraying behavior.
At 11 months, he had already passed through kitty puberty and was ready to breed. The hormonal effect upon his personality was set, the territorial impulse is there.
He's marking his territory as an alpha male, but will be a bit confused as he can no longer consummate the feelings.
Patient, persistent kindness in redirecting his impulses is what I counsel.