Blood In Vomit in Dogs

See your vet immediately. Blood in vomit, also called hematemesis, is never a normal finding in dogs. Sometimes the amount is small, such as a few red streaks after repeated retching. In other cases, it may look like bright red blood, dark clots, or brown-black material that resembles coffee grounds, which can suggest partially digested blood from the stomach or upper small intestine.

This symptom has a wide range of causes. A dog may vomit blood after severe stomach irritation, swallowing a foreign object, eating a toxin, developing an ulcer, or having a bleeding disorder. Blood can also come from the mouth, nose, or throat and then be swallowed before vomiting. Because the source is not always obvious at home, it is safest to treat blood in vomit as urgent.

Some dogs otherwise seem fairly normal at first, but that does not rule out a serious problem. Vomiting can quickly lead to dehydration and electrolyte changes, and ongoing bleeding can cause anemia or shock. If your dog is weak, pale, painful, repeatedly vomiting, or has black tarry stool, the situation is more urgent.

Try to note what the vomit looked like, when it started, how often it is happening, and whether your dog could have gotten into medications, trash, bones, toys, or toxic foods. That history helps your vet narrow the cause faster and choose a care plan that fits your dog’s condition and your family’s goals.

Common causes of blood in vomit include irritation and inflammation of the stomach or upper intestines, especially after repeated vomiting, dietary indiscretion, garbage eating, or exposure to irritating substances. Stomach and intestinal ulcers are another important cause. Ulcers may develop after certain medications, especially human pain relievers and some anti-inflammatory drugs, or with severe illness affecting the liver, kidneys, or other organs.

Foreign material is a major concern in dogs. Toys, socks, bones, corn cobs, rawhide, and other swallowed items can scrape tissue, block the stomach or intestines, and trigger repeated vomiting with blood. Toxins are also high on the list. Chocolate, xylitol-containing products, human medications, rodenticides, and many household substances can cause vomiting, bleeding, or both.

Blood in vomit may also be linked to pancreatitis, severe gastroenteritis, parasites, tumors, clotting disorders, or trauma. In some dogs, blood is swallowed from a nosebleed, oral injury, dental disease, or coughing up blood from the airways and then appears in vomit. That is one reason your vet will want to confirm whether your dog is truly vomiting, regurgitating, or coughing material up.

Less common but serious causes include liver disease, kidney disease, immune-mediated disease, and cancers affecting the stomach or nearby organs. Because the list is broad, there is no safe way to diagnose the cause from appearance alone. The amount of blood does not always match the severity of the problem.

See your vet immediately if your dog vomits blood even once and also has weakness, pale gums, collapse, a painful or swollen belly, black tarry stool, repeated retching, trouble breathing, fever, or signs of toxin exposure. Emergency care is also important for puppies, senior dogs, and dogs with known liver disease, kidney disease, clotting problems, or a history of ulcers.

A small streak of blood after one episode of vomiting can happen with irritation, but it still deserves a same-day call to your vet. Dogs can worsen quickly, especially if they continue vomiting or are losing fluid. Repeated vomiting can lead to dehydration and dangerous electrolyte shifts, while ongoing bleeding can reduce oxygen delivery to tissues.

Do not give human stomach medications, pain relievers, or anti-nausea drugs unless your vet specifically tells you to. Some over-the-counter products are unsafe for dogs, and others can make diagnosis harder. If you suspect your dog ate a toxin or medication, contact your vet right away or call ASPCA Animal Poison Control.

Until your dog is seen, keep the vomit if possible or take a photo, and note any recent diet changes, medications, chews, trash access, or missing household items. If your dog is actively vomiting, weak, or may need sedation or imaging, your vet may advise withholding food while still getting your dog evaluated promptly.

Your vet will start with a physical exam and a detailed history. Expect questions about when the vomiting started, what the blood looked like, whether your dog has diarrhea or black stool, recent medications, possible toxin exposure, chewing habits, and any chance of swallowing a foreign object. Your vet will also want to know whether the material was truly vomited with retching or passively brought up, which may suggest regurgitation instead.

Initial testing often includes bloodwork, such as a complete blood count and chemistry panel, to look for anemia, dehydration, infection, organ disease, and electrolyte changes. A fecal test may be recommended if parasites or infectious intestinal disease are possible. Urinalysis can help assess hydration and organ function. If a bleeding disorder is suspected, clotting tests may be added.

Imaging is commonly part of the workup. X-rays can help identify foreign material, obstruction, abnormal gas patterns, or other urgent abdominal problems. Ultrasound may be recommended to look more closely at the stomach, intestines, pancreas, liver, spleen, and abdominal fluid. In some cases, chest imaging or an oral exam under sedation is needed if the blood may be coming from the respiratory tract or mouth.

If the cause is still unclear, your vet may discuss endoscopy to look inside the esophagus, stomach, and upper small intestine and possibly collect biopsies. Dogs that are unstable may need treatment first, including IV fluids, anti-nausea medication, stomach protectants, pain control, and sometimes blood products, before more advanced diagnostics are safe.

Home care depends on the cause, so follow your vet’s instructions closely. In general, monitor for any repeat vomiting, dark or bright red blood, black tarry stool, weakness, belly pain, poor appetite, or trouble keeping water down. Keep a log of when vomiting happens, what it looks like, and whether medications or meals seem to trigger it. Photos can be very helpful for rechecks.

If your vet recommends home management, offer only the diet and medications they prescribed. Give small, measured meals rather than a large meal unless your vet advises otherwise. Make sure fresh water is available unless your vet gives different instructions. Never start human medications on your own, especially ibuprofen, naproxen, aspirin, bismuth products, or other over-the-counter remedies, because some can worsen bleeding or be toxic to dogs.

Rest is important. Prevent scavenging, chewing toys that can be swallowed, access to trash, and strenuous activity until your dog is stable. If a medication may have contributed to the problem, ask your vet before giving the next dose. If toxin exposure is possible, save packaging and bring it with you.

Go back to your vet right away if vomiting continues, blood increases, your dog seems weak or painful, gums look pale, or your dog stops eating or drinking. A dog that looked stable in the morning can become much sicker by the evening when bleeding, dehydration, or an obstruction is involved.