We have a shelter pom who weighs 20 pounds. He is not overweight but large for a pom.
I suspect he was a shelter dog because he has serious issue with territorial marking although he is otherwise housebroken. Short of diapering him, we have not had success with stopping the marking behavior. We decided to deal with it as best we could and replace carpet after he passes away.
Although he is medicated daily for arthritis, every day is good day for him once he gets his engine warmed up in the a.m. He is the perennial favorite dog of the visitors to our home.