Hello! I have a 5 year old neutered male cat. He was always a well behaved cat too. He never pooped outside of the box before and I was cat sitting for a friend for 8 weeks who was a spayed elderly cat. She did not like my cat and would hiss every time he walked by. She was becoming a problem. Peeing and pooping all over the house. And then finally she went home. Now my cat won't poop on the litter box anymore. He is not they dominant type. He never has been. And he has lived with other cats just fine before years ago. I've tried to re train him and show him the litter box, I even bought a brand new one to see of it was her scent he didn't like. It's as if he is afraid of the box, when I go to take him to the box he gets so scared and jumps out of my hands. Before I take him to the vet, i just wanted peoples thoughts kn what it night be and what can I do to help him use it again?