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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.
Stress or Anxiety. Stress may be the reason why you see your dog back legs shaking. Writing for vetstreet.com, Dr. Patty Khuly, VMD, a veterinarian based in Miami, Florida says that stress-related shaking can be confined to the hind legs only, even though it tends to affect the whole body.