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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.
HiCustomer. Dogs shiver/shake/tremble for a variety of reasons. First and the most obvious to most people is the fact that they are indeed cold. Shivering contracts the muscles to stimulate heat. Since I assume you have already addressed this issue--lets explore other possibilities. The next two are medical and behavior issues.