Food problem maybe? Waffles (yorkie-poo) had many problems early on from food. Lotsa throwing up, lethargic, shaking, nose dry then nose drippy, rubbing eyes and ears, tummy gurgles, and wouldnt gain weight. Turns out she cant have corn, soy, wheat, potato, rosemary (why thats in dog food still baffles me)
But since we avoid those items shes ok. Call your vet and talk to them. Some things can be handled just over the phone. But anytime your lil one isnt well, call the vet.
Welcome to YT post a pic of Mollie.