There has been a gray cat in my yard for weeks off and on. He follows my cat around constantly...so I named him Shadow. He never seems hungry, but is very thin. He has not been neutered and sprays everywhere. I am assuming he is a stray, but have no proof of that. If I knew for sure he was a stray I would try to find him a home. He is really cute, but because I already have 4 cats, I don't want to take another one in. How do I find out for sure that he's a stray and not someones pet? I know he doesn't belong to anyone in my immediate neighborhood.