Dog Pooping Black, Not Eating and Vomiting (Here’s Why)

Dog Pooping Black and Not Eating and Vomiting: Symptoms

Depending on the underlying problem, other symptoms may occur at the same time, including:

• Black or tar-like poop

• Refusing food or reduced appetite

• Vomiting or repeated retching

• Weakness or unusual tiredness

• Abdominal discomfort

• Diarrhea or abnormal stool

• Pale-looking gums

• Increased sleeping or reluctance to move

Dog Pooping Black and Not Eating and Vomiting: Common Causes 

Gastrointestinal Bleeding

One of the most important causes of genuinely black, tar-like stool is bleeding somewhere in the upper digestive tract. As blood is digested, it can turn the stool dark and sticky.

A dog experiencing gastrointestinal bleeding may also vomit, lose interest in food, become weak, or show pale gums.

The severity of the signs can vary depending on how much bleeding is occurring and what is causing it.

Black, tarry stool accompanied by vomiting and appetite loss should therefore be evaluated promptly rather than assumed to be ordinary diarrhea.

Related: Dog Pooping Black and Not Eating (What it means)

Stomach or Intestinal Ulcers

Ulcers can develop in the stomach or intestines and may cause bleeding, pain, nausea, vomiting, and appetite loss. If bleeding occurs higher in the digestive tract, the resulting stool may become black and tar-like.

Some dogs may appear uncomfortable when their abdomen is touched or may become less interested in normal activities.

Ulcers can have different underlying causes, including certain medications and other illnesses, so veterinary examination is important for identifying the cause and choosing appropriate treatment.

Read more: Dog Black Diarrhea (Causes and treatment)  

Medication-Related Gastrointestinal Irritation

Certain medications can irritate the stomach or intestines and, in some circumstances, contribute to gastrointestinal bleeding.

This is particularly important when a dog develops vomiting, appetite loss, or black stool after starting a medication.

Tell your veterinarian about all prescription medications, supplements, and other products your dog has received recently.

Never give human pain medications to a dog unless a veterinarian specifically instructs you to do so. Some human medications can cause serious gastrointestinal complications in dogs.

Eating Something Unusual

Dogs sometimes eat garbage, spoiled food, table scraps, plants, or other things that can upset the digestive tract. This can cause vomiting, diarrhea, mucus, appetite loss, and changes in stool color.

Some foods may also make poop appear darker without causing gastrointestinal bleeding.

However, if the stool is genuinely black and tar-like and your dog is vomiting and refusing food, it should be taken seriously.

Tell your veterinarian about anything unusual your dog may have eaten in the previous few days.

Foreign Body or Intestinal Obstruction

A dog that swallows a toy, bone, fabric, plastic, or another object can develop irritation or an obstruction in the digestive tract.

Vomiting and refusal to eat are common warning signs of a possible obstruction.

Diarrhea or abnormal stool can sometimes occur as well, particularly early in the problem. If the digestive tract becomes injured or bleeding occurs, stool may appear very dark.

A suspected obstruction requires prompt veterinary assessment because it can become life-threatening if the intestinal tract is severely affected.

Gastrointestinal Infection

Some gastrointestinal infections can cause vomiting, diarrhea, reduced appetite, and changes in stool. If inflammation or bleeding occurs within the digestive tract, the stool may become unusually dark.

Other signs can include abdominal discomfort, fever, dehydration, or lethargy, although the exact symptoms vary.

A veterinarian can determine whether testing is appropriate based on your dog’s examination and the severity and duration of the illness.

Read more: Dog pooping black but acting normal (Here’s why)

Pancreatitis

Pancreatitis is inflammation of the pancreas and can cause vomiting, appetite loss, abdominal pain, diarrhea, and lethargy.

Some dogs may develop digestive symptoms after eating rich or fatty food, although pancreatitis has multiple possible causes.

Black stool is not specific to pancreatitis, so a dog with black poop needs to be evaluated for other potential causes of gastrointestinal bleeding as well.

Dogs with persistent vomiting, significant abdominal discomfort, or marked weakness should receive prompt veterinary care.

Other Internal Disease

Underlying diseases affecting organs such as the liver or kidneys can contribute to digestive symptoms, poor appetite, vomiting, and other changes in overall health. Some illnesses can also increase the risk of gastrointestinal complications.

This becomes particularly important when symptoms are persistent or occur alongside weight loss, increased thirst or urination, weakness, or other changes.

Blood tests and other diagnostic procedures may be needed to determine whether an underlying systemic illness is contributing to the problem.

Related: Old Dog Pooping Black and Not Eating (What it means)

Dog Pooping Black. Not Eating and Vomiting: What to Do

If your dog is pooping black, refusing food, and vomiting, contact your veterinarian promptly rather than waiting several days to see whether the symptoms disappear.

Keep fresh water available, but do not force your dog to eat or drink. If your dog vomits whenever they drink or cannot keep water down, seek veterinary attention promptly.

Take a photograph of the black stool if possible. A fresh stool sample may also be useful if your veterinarian wants to perform fecal testing.

Write down when the vomiting began, how frequently it is happening, when your dog last ate, and whether the stool is black and tar-like or simply darker than usual.

Tell your veterinarian about any medications, supplements, treats, dietary changes, and possible exposure to garbage, toxins, or foreign objects.

Do not give human medications or home remedies unless your veterinarian specifically recommends them. Some medications that are commonly used by people can be dangerous for dogs, particularly when gastrointestinal bleeding is possible.

When to Call or Visit the Vet

Black stool accompanied by vomiting and refusal to eat warrants prompt veterinary attention. The concern is greater if the stool has a sticky, tar-like appearance or your dog is becoming weak.

Schedule an appointment if you notice:

• Black or unusually dark stool that continues

• Reduced appetite or refusing food

• Recurring vomiting

• Repeated diarrhea

• Gradual weight loss

• Increased tiredness

• Recurring abdominal discomfort

• Repeated episodes of abnormal stool

Seek emergency veterinary attention immediately if your dog develops:

• Weakness, collapse, or difficulty standing

• Pale, white, or gray-looking gums

• Repeated vomiting or inability to keep water down

• Vomiting blood or very dark material

• Large amounts of black, tar-like stool

• Severe abdominal pain

• A swollen or tense abdomen

• Extreme lethargy or distress

• Suspected ingestion of a toxin or foreign object

Dog Pooping Black, Not Eating and Vomiting: Treatment

Veterinary treatment for a dog pooping black, not eating, and vomiting starts with a thorough examination, including assessment of the gums, hydration, abdomen, and overall condition, along with a review of the dog’s diet, medications, and possible toxin or foreign-object exposure.

The veterinarian may recommend blood tests, fecal testing, X-rays, ultrasound, endoscopy, or other diagnostic testing when appropriate to identify gastrointestinal bleeding, obstruction, inflammation, or an underlying illness.

Treatment may include fluid support, prescription medication for nausea or gastrointestinal protection, dietary management, pain relief, treatment for parasites or infection when indicated, or other targeted therapy based on the diagnosis. 

Recovery and Monitoring

Recovery depends on the underlying cause. A mild digestive upset may resolve with appropriate supportive care, while ulcers, gastrointestinal bleeding, pancreatitis, foreign bodies, or internal disease may require more extensive treatment.

During recovery, monitor your dog’s appetite, water intake, energy level, gum color, vomiting, and bowel movements.

Pay particular attention to whether the stool remains black and tar-like or gradually returns to its usual appearance.

Follow your veterinarian’s instructions about feeding, medication, and activity.

Do not reintroduce rich foods, treats, or other dietary changes until your dog has recovered and your veterinarian has advised you on returning to a normal diet.

Follow-up care may be necessary when gastrointestinal bleeding or an underlying chronic condition has been diagnosed.

Additional tests can help determine whether the original problem has resolved or needs further treatment.

Key Takeaway

Dog pooping black and not eating and vomiting can result from several digestive problems, but genuinely black, tar-like stool may indicate digested blood.

Gastrointestinal bleeding, ulcers, medication-related irritation, foreign objects, infections, pancreatitis, and other illnesses can cause some combination of these symptoms.

Because vomiting and refusing food can contribute to dehydration and weakness, black stool should not be dismissed as a routine stomach upset

. The combination is particularly concerning when your dog appears weak, has pale gums, experiences repeated vomiting, or passes large amounts of tar-like stool.

If your dog is currently pooping black, refusing food, and vomiting, contact your veterinarian promptly.

Seek emergency veterinary care if your dog becomes weak, collapses, cannot keep water down, develops severe abdominal pain, or shows other signs of serious illness.