My newest and youngest girl, Juniper, will have occasional full body vibrations. She's four weeks and hasn't had her first heat yet, so i know it's not that. It worries me a little. None of my previous girls have done this, this young. I've also misplaced my tetracycline and can't start her on it till the shop opens in the morning (she's got a myco flair up and I'm trying to catch it before it goes full blown uri) and I'm wondering if maybe the flair up is related.