We've got two mutts, one came from the pound when he was 6 months old. He also never learned to play, is deathly afraid of anyone but Martha and me. He is too uncoordinated to run, he sort of hops. He has two knicknames, "hoppy dog" because of his crazy gait, and DLP (defiant little prick). When in DLP mode, we have to use the authoritative voice, but it really does no good. The other dog, Angel adopted us, and pretty much lives up to her name.