Sorryto hear your little yorkie is not feeling so good. I have a little yorkie Tina who has an "Acid Stomach" Every once in a while she will vomit bile, the yellow stuff and act dumpy and not herself. She doesn,t want to play or be bothered. Basically she wants to be left alone. She usually gets over this within a day or two. The vet said it is not uncommon in small dogs, especially if they are 5 lbs or less to have this condition. I have an anti-nausea med. for her and I can also give her pepto-bismol. I would ask your vet before giving your little baby anything, but it helps Tina. Hope this helps.