Obsession is a trait that I usually see in dogs who are bored. They become frustrated because they sit behind walls all day and have nothing to do. The only way they know how to release that frustration is to find something that attracts them and to fixate on it.

A dog can easily become fixated on seemingly harmless objects, like Patches's love of paper, which almost cost him his life. When a dog is at the height of his obsession, there are no limits! He will ignore pain, hunger, and almost any sign of danger. While it may seem that your dog is enjoying himself, he's not. Obsession is a very unhealthy habit.

What you need to do is redirect his focus. For instance, if you find him with an object of fixation, remove it and take him on a walk instead. In fact, make sure your dog gets adequate exercise before you leave the house. And don't be afraid to create games for him, like hide and seek. Be creative because if you have fun with it, your dog will too.