Just found this article. Apparently, if your dog only started doing this (and you've never noticed it before - wouldn't hurt to visit a vet). And - if you're sure he's happy, healthy, and being his usual self otherwise - you may want to wait a day or two - wouldn't it be nice if it just went away!!!
Carol Jean
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Trembling, Shaking and Shivering in Dogs
Many dogs, mostly small breeds, tremble or shake for no apparent reasons. Most vets, when pressed, can think of obscure diseases that can cause such trembles but in most cases the dog tests healthy in every other area. Thus, no one has really been able to explain why some dogs shake and shiver even when they are warm and have no reason to be nervous.
If your dog shivers excessively or suddenly starts shaking it may be cause to consult your veterinarian (as sudden onset can be a symptom of pain or a nervous disorder) but if full body shivering or a foot or leg that trembles is something you've noticed from puppyhood then your dog's shaking is probably nothing to worry about. Although not explained, it has been noted that trembling legs occur more often in terriers and white dogs.
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