Dear Mary,
Your cat has a stress related disorder. As you know he is a high strung cat. It is very frightening and unnerving to him to smell urine from outdoor cats. First, disinfect all sayed areas with an enzyme cleaner like odor mute or natures miracle so you cat will no longer smell this. Next, spray feliway so he wil not be motivated to remark any spots. You an also use feliway plug ins and rescue remedy to calm him. He will stop all these nervous behaviors whan he no longer feels threatened by the strays and his coat will grow back.
Please let me know if yiou still have any questions. I am happy to help.
Very sincerely,
Terri
Dedicated to Cats and the people who love them!
Please press ACCEPT if my answer was helpful and leave feedback Thank you! Terri