>>Cookie will do that, but only occasionally if she sees or hears something that intrigues her like another dog bark. It may just be that he is constantly on gaurd and over protective. Pretty much just ready for anything, know what I mean? That would be my guess, but it is just that, a guess.
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It likely means he's in a defense drive and is overly aroused. Not a good sign when a dog feels that way about going out in general. I've had two that did it. One was resolved by neutering and the other by training. It's not a good sign. By the way, a good way to learn more about drives, including this one, is the book "Dog Training for Dummies," by Jack and Wendy Volhard. I don't do everything the way any other trainer does--I'm always refining things for the individual dog I'm handling. But my own training probably comes closer to theirs than to any other "book" training.
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Kathy Diamond Davis, author, "Therapy Dogs: Training Your Dog to Reach Others," 2nd edition, and the free Canine Behavior Series at www.veterinaryforum.com