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Originally Posted by mizzwanned Well with the tiny yorkies, yes i have seen it a lot. In Sophie's case it def. was when she was nervous. She wasn't cold, i could tell when she was cold and also not low blood sugar. Cause usually when she shook it would be when we were either going somewhere unfamiliar to her or if she was around a lot of dogs, cause she would be nervous. Her shaking def. decreased tho, over the months she was with us and that made me happy. I think she felt more at ease with us and she never shook in the house anymore |
So it is your opinion it happens more with tinies? I haven't been around too many of them, but I wonder why they would be more prone to it, lack of body fat is the only thing I can come up with.

Here's an example of some of the things I've read.
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Dogs tremble and shake because they are scared, cold, excited or have a medical condition that is either chronic, viral or they have ingested certain types of poison. Chronic conditions include epilepsy or the onset of muscle weakness or failure which usually accompanies old age. Viral infections such as kennel cough or parvo will also cause trembling, as will the ingesting of boric acid, commonly used as rat poison. Shaking is common in some breeds of dog, like toy chihuahuas, but severe trembling that goes on for any prolonged period, longer than ten minutes, usually is an indication that something is seriously wrong with the dog and he/she should be watched closely and, most likely, taken to the emergency room. Dogs, like people, go into shock as they are approaching death and the shaking is oftentimes a physical manifestation of this shock. WikiAnswers - Why do dogs tremble or shake |
I guess it seems like if they are shaking because they are scared, that shouldn't be happening frequently, but at a specific time, such as riding in the car, or some event that scares them. If they are shaking for no reason, I guess I would be worried what had traumatized them, or whether they had some underlying medical condition.