I have a question about my Dad's cat who I took to the vet to be neutered on Friday, I went to pick him up at 4:00pm as soon as we got home we let him out of the carrier, went to his litter box and smelled like he SPRAYED. Can a neutered cat still spray. I had always heard that once neutered they didn't spray anymore. Before he went to the vet he had never sprayed and my dad has had him about a month he is an inside cat. He is also the only animal in the house.