My Sebastian is almost five months and he shakes when I leave for work. When I first got him, It made me feel horrible but I have come to realize that yorkies do have the tendendcy to do this. He has gotten better but on the weekends when I am with him all day, when Monday comes around he is back to shaking again. It could have a lot to do with their size or a number of things. Although, I don't think it's something to be extremely worried about.
