My house cat who is fixed and has, his shots up to date. Got out of the house and was attacked by another cat. Who run around the neighborhood I think the owners moved and left it. He howl like he is looking for a female. Anyway, He attack my cat and now Rex has a puncture wound on his hind leg. and is lying around. He is eating and drinking and looks good. but is there something i should clean his wound with? Or just let it heal?