I'd get him neutered ASAP because he's already 3 years old and has an undescended testicle. It can become cancerous. He's also marking all over your house and outside because he's intact. Neutering may not help with the marking now since he's 3 already unfortunately. Belly bands will definitely help keep the urine off your floor and furniture though.
have you ever tried crating him? will he potty in the crate even if its really small? what about wee wee pads? does he use those?
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