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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.
A dog that is stressed or fearful may experience panting and shaking. You need to identify the stress or fear factor and remove it. Often, the stress or fear may be caused by other dogs or animals or loud noises your dog is not used to. If the dog is in a state of shock, he may start panting and shaking.