Okay so this is not about my yorkie, its about my other dog, sharpie, he is a non-yorkie. Sharpie is a beagle/pekignese mix. My question is as follows, the other day he started doing this thing were it looks like he is shivering but just his lips, they do what people do when they are cold, now i live in southwest florida so its not cold most of the time and it was not windy... is this normal? What are some recommendations? should i be worried? he is acting normal, eats very well, plays alot, is spunky and lovable.. i dont see any different in his bahavior patterns? Please let me know if you guys have heard of this happening.
You can see pictures of him in my album

bu i have attached ones from when he was smaller