Perhaps even more than regular dogs, a service dog may tend to be overprotective of its master. Shadow definitely is. He's a psychological service dog whose owner, Dan McManus, suffers from separation anxiety. That's why Shadow used to get so upset whenever McManus would go hang gliding. When McManus was in the air, Shadow couldn't keep him company and therefore keep him safe. Being left on the ground upset Shadow so much that McManus chose the most obvious solution: He took Shadow into the sky with him.