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Tension or Temperature. Dogs may shake as a way of relieving tension. If a dog is feeling nervous or uncomfortable in a situation, it might shake the whole body as a way of shaking out tension. This behavior also may function as a means of getting attention from other dogs or people.
Dogs commonly shake when their coats are wet. Dogs tend to have a whole lotta shaking going on. When your hound shakes itself, this may be a habit, a functional behavior or a symptom. If your dog experiences uncontrolled shaking, seek veterinary advice.