Burmese kittens & cats in Albany, Oregon

Rex is 2 years old and was adopted from a shelter when he was 8 wks. He is 9.5 pounds, but LOVES to eat. He eats 3 oz of wet cat food twice a day, and has grain-free dry food available all the time. He also loves treats, but only gets a few a day. He has a playmate, female, about the same age, that we adopted at the same time from a different shelter. They get along well. They both love to go outside and play in their catio, which is a large enclosed "cat patio", via a cat door and tunnel, but they are strictly indoor cats. He isn't a lap cat, but will ask for affection. He still loves to play, especially with moving toys, and likes to run and chase things, like a small ball on a string, or feathers, etc. He likes small furry mice and soft wool balls when I "soak" them in catnip. Rex has started urinating (not spraying) in various places in the house - it started when we were gone for a month on vacation and the house/cat sitter we had turned out to be not very good or reliable!