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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 shake because it's just something some of them do leaves me-almost-shaking with disappointment. From the vets and behaviour experts I have asked this question of, the most common consensus has been that shaking is most often as a result of a build up of energy rather than fear or indeed reaction to cold.