Runt is a slow-witted dog that keeps up a happy-go-lucky streak despite his life as a stray. He has a hatred for cats, which is why Rita doesn't correct him for mistaking her for a dog. Despite that, he is extremely friendly to the people he and Rita come across, or as he puts it "definitely very friendly". However, they do not seem to return the favour, but Rita genuinely cares about him. Runt will protect Rita from anything, even if he has to lose a home or even Rita.