What does it mean when your does sometimes shake and has spasms?

This had happened to him twice, i took him to the vet and both times they said it was nothing that he could've eaten something, but what if it's something else? Should i take him to another vet?oops i meant dog not does...=o)

    What does it mean when your does sometimes shake and has spasms?

    This had happened to him twice, i took him to the vet and both times they said it was nothing that he could've eaten something, but what if it's something else? Should i take him to another vet?oops i meant dog not does...=o)...
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