 He is gifted with partial anthropomorphism, as he demonstrates capabilities of walking on two legs, driving, gambling, or interaction with human characters.It was revealed in one episode that Happy was somehow mysteriously separated from his biological mother at a young age and that Mother's Day formerly presented unhappy connotations for him, though after a dog named Rose claiming to be his mother was revealed as a deceptive impostor, he grew to appreciate his adoptive family with the Higgenbottoms further.Happy appears to have a shady background, as he was formerly trained by a secret agency as an undercover dog and was treasured as an agent, though later wound up leaving this past behind.