I would only guess that a dog does a behavior "wrong" because he misunderstood my teaching.

Our beloved (long a resident at The Rainbow Bridge by now) Great Dane mix, Gracie, was just not very smart. She never understood when we tried to teach her even a simple behavior like "catch the treat" - we could be accurate enough to toss the treat so it bounced off her nose, she just never understood she was supposed to open her mouth and catch it. We eventually gave up, as she would just get confused, and decided that we'd all be better off just loving her for the big black goofball she was.