Today my neighbour from across the street came to my door complaining about my cat. He said that he and his wife have let it go for months and that my cat is traumatising his. He told me his cat used to love going outdoors but my cat has seemed to claim his garden as his territory and watches his cat at the window, scaring his cat from coming out. He then said that his cat was out today and his wife heard cats fighting outside, she looked out and the 2 cats were fighting ( apparently my cat got the better of theirs and left chunks of fur lying in the back garden.) I apologised and got my cat inside but he has also been leaving bits of fur lying around the house. I don't know what to do now to stop this happening again and keeping my cat indoors is just not an option. Thanks for your help.