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Dogs have a built in working instinct and love to have a “job” to do. They thrive at any chance to participate, which is why a bored or under-stimulated dog may repeatedly escape the yard or display what we call “destructive behavior” in the home, when he is really just trying to be true to his primal desires by keeping his mind and body active. (Maybe we humans can take a lesson in this!)
A stimulated dog is a happy dog.