Wow, I had no idea! I rehomed Timber from my daughter-in-law last summer. She had Timber for six months. She (and my son and granddaughter) are in and out of my house all the time. I have to say it never occurred to me that it might have an adverse affect on him. Just when you think you are starting to get a handle on things, you get another surprise. That said, if it bothers him he hides it well. It might help that he never really got close to any of them, which is one of the many reasons they decided they couldn't keep him. Makes me sad to think it might be bothering him though!