I've noticed this yesterday. He's been acting normal. Eating/Playing. He's 5 and neutered. I wish I can attach an image. It;s not on his fur its to the right of his anus next to the hole. I thought it could be a piece of feces but when I went to wipe it with warm cloth it wasn't coming off and he was getting annoyed. His anus is completely fine no swelling or redness. What could this be?