My Dog Threw Up Blood Clots – Top 3 Reasons Why

Disclaimer: The content on is for informational purpose only. It is not intended to be a substitute for professional veterinarian advice, diagnosis, or treatment. Always seek the advice of a veterinarian when in doubt.

If your dog is throwing up blood clots or something dark that looks like coffee ground, it typically means the dog is having issues in the middle or lower end of the gastrointestinal system. Here are the most common reasons for dogs that throw up blood clots.

1. Physical injury along the dog’s digestive tract

A physical injury may have resulted in internal bleeding along the dog’s digestive tract. The activated clotting time for a healthy dog is typically between 60 to 110 seconds. This suggests it’s unlikely that the dog is throwing up blood clots from bleeding in the mouth. Instead, the clotted blood could be coming from internal bleeding in parts like the stomach or small intestines. The ingestion of non-food items is a common reason for dogs that suffer from internal physical injuries.

2. Irritation from stomach ulcers

Dogs may throw up blood clots if they are suffering from ulcers in the stomach or intestines. Ulcers develop when the barrier (that protects the organ lining from the harsh stomach acid) erodes. The lining of the stomach or intestines can start to bleed with little protection from the harsh acid. The bleeding will turn into blood clots by the time the dog throw ups and gets the blood out from their body.

3. Infections like Parvovirus

Parvovirus can also cause dogs to throw up blood clots. This can start to happen within 24 to 48 hours of the dog getting infected by the virus. In addition to throwing up blood clots, dogs with the parvovirus may also suffer from bouts of bloody diarrhea.


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