[Maximo]

Welcome to Yorkie Talk. I'm sorry your little one is ill. Has your vet done blood tests?

Here is a good place to start looking for a AAHA accredited vet:
AAHA Healthy Pet | Pet Hospital Search

You may also want to consider going to a specialist or vet school hospital. I hope someone has a local recommendation for you.

There is a wide range of potential causes for vomiting blood. Here is some information from petMD:

Causes


A wide variety of causes may be responsible for hematemesis (womiting blood). Gastrointestinal diseases, such as inflamed bowels from inflammatory bowel disease (IBD -- common in Yorkies), or ulcers, can both be causes for hematemesis. Various metabolic, neurological, respiratory and viral infections may be responsible for incidents of hematemesis, as can conditions such as liver failure, head trauma, or heartworm, respectively,

Coagulopathy, or lack of proper blood clotting, may result from liver failure, or a reduced blood platelet count (thrombocytopenia) due to drug exposure. Ingestion of rat poison may also be a cause of improper blood clotting. Hematemesis may also follow a traumatic incident, such as severe burns, heat stroke, major surgery, exposure to poisons from heavy metals, such as iron or lead, and snake bites. Exposure to toxic plants and pesticides may also cause vomiting of blood.

Critically ill animals are at a higher risk for hematemesis. Other factors that can increase the risk of hematemesis are certain drugs, such as NSAIDs, or non-steroidal anti-inflammatories; shock; or thrombocytopenia - a reduced blood platelet count.

Diagnosis


Tests for diagnosis include blood tests, and urine and fecal analysis. Imaging tests such as ultrasound and X-ray may also be used to pinpoint inner disturbances. Through these diagnostic tests, the diagnosis for hematemesis may range from any number of the aforementioned causes, from contact with toxic substances to liver damage.

Please keep us updated.