My mother's dog Skippy (now ours) doesn't KNOW that he is a dog. When we take him to the dog park he is uninterested in chumming with any of the other dogs...even those that come up to him and act friendly. He also has no interest in the water as others seem to enjoy. He makes one round with us around the track and is ready to go back home. He always acts excited to go, but is even MORE happy to get back in the car to go home.
He plays once in a great while with one of our cats (Peaches) but gives wide birth to our other one (Dusty) who gives Skippy the evil eye. Quite the household we have! Ha!