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why does my dog shake when he's falling asleep why does my dog shake when falling asleep why does my dog twitch when falling asleep why does my dog shake before falling asleep why is my puppy shaking when falling asleep why does my dog shiver before falling asleep why is my dog shaking and falling asleep why is my dog shaking when he's sleeping why does my dog shake when he's asleep what does it mean when your dog is shaking when sleeping
