My rat Grayson recently started jerking his whole body when he gets relaxed on me. It's almost like a heart beat in rythm. I've only noticed it three times in the last 5 days. It seems to be when he's bruxing. What could this be? I don't know if I should be concerned. Also it doesn't last very long. Maybe 20 seconds. And there is no noise associated with it.
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