Dog Diarrhea and Throwing Up Bile (Explained)

There are several reasons why your dog may experience diarrhea and bile vomiting at the same time:

1. Gastrointestinal Infections

Gastrointestinal infections are one of the most common causes of diarrhea and vomiting of bile in dogs. These infections may be caused by:

• Bacteria (like Salmonella or E. coli)

• Viruses (such as parvovirus or coronavirus)

• Intestinal parasites (like Giardia or roundworms)

These pathogens irritate the lining of your dog’s stomach and intestines, leading to inflammation, vomiting bile, and diarrhea.

Your dog may also show symptoms such as fever, loss of appetite, and lethargy.

Prompt veterinary treatment is crucial, especially in puppies or elderly dogs, to avoid dehydration and complications.

Related: Dog diarrhea and gas (Explained)

2. Empty Stomach and Bile Build-Up

A very common reason for a dog to throw up bile and have diarrhea is an empty stomach.

If your dog hasn’t eaten in a while, bile can accumulate and irritate the stomach lining, leading to vomiting.

This vomiting can, in turn, trigger diarrhea due to stress on the gastrointestinal tract.

This condition is often referred to as bilious vomiting syndrome and is more likely to occur in the morning or late at night.

To prevent this, feeding your dog small, frequent meals throughout the day can help regulate bile flow and reduce irritation.

3. Dietary Indiscretion

Dog diarrhea and throwing up bile can also result from eating something inappropriate—this is known as dietary indiscretion.

Dogs are naturally curious and may ingest:

• Spoiled food

• Garbage

• Table scraps

• Non-food objects like socks, toys, or plastic

When a dog consumes something their digestive system can’t handle, it may cause acute gastroenteritis, leading to vomiting bile and diarrhea.

Mild cases may resolve on their own, but ingestion of toxic or indigestible substances requires urgent veterinary care.

4. Sudden Change in Diet

If you’ve recently changed your dog’s food, this may be the reason for dog diarrhea and bile vomiting.

A sudden switch can disrupt the delicate balance of gut bacteria, leading to gastrointestinal upset.

Some dogs may also develop food sensitivities or allergies, especially to common ingredients like chicken, beef, or grains.

This can cause chronic diarrhea and intermittent vomiting of bile.

To avoid this, always transition to new food gradually over 7–10 days by mixing increasing amounts of the new food with the old one.

5. Pancreatitis

Pancreatitis in dogs—inflammation of the pancreas—can cause severe symptoms, including:

• Vomiting bile

• Diarrhea

• Abdominal pain

• Lethargy

• Loss of appetite

This condition often develops after a dog consumes fatty or greasy food.

The pancreas becomes inflamed and releases digestive enzymes that damage surrounding tissue.

Pancreatitis is a serious medical emergency.

If you suspect it, take your dog to a vet immediately for diagnosis and treatment.

6. Intestinal Blockages

Dogs that swallow foreign objects may develop intestinal obstructions, which can cause vomiting, bile, and diarrhea.

Common culprits include:

• Bones

• Toys

• Hairballs

• Rocks

A blocked intestine prevents food and liquid from passing, leading to severe gastrointestinal symptoms.

Along with vomiting and diarrhea, your dog may have a bloated abdomen, cry in pain, or be unable to defecate.

Surgery may be needed to remove the blockage, so prompt veterinary care is critical.

Related: Dog diarrhea and straining (Explained)

7. Liver or Gallbladder Disease

Liver dysfunction or gallbladder problems can affect how bile is processed in your dog’s body.

This may result in:

• Yellow or green bile vomiting

• Soft or runny stools

• Jaundice (yellowing of eyes or gums)

• Weakness

When the liver doesn’t function properly, it can’t filter toxins or regulate digestion effectively.

This causes gastrointestinal distress, leading to both dog diarrhea and vomiting bile.

Diagnosis may require blood work, ultrasounds, or biopsies.

8. Stress or Anxiety

Stress is another overlooked factor that can lead to dog diarrhea and bile vomiting.

Events like moving to a new home, separation anxiety, loud noises (like fireworks), or boarding can trigger gastrointestinal upset in sensitive dogs.

Stress can cause increased gastric acid production and gut motility, leading to nausea, vomiting bile, and loose stools.

If you notice these symptoms during stressful events, it may be beneficial to use calming aids or consult your vet about behavior training.

9. Side Effects of Medication

Some medications can irritate your dog’s digestive system and lead to diarrhea and vomiting bile.

Common culprits include:

• Non-steroidal anti-inflammatory drugs (NSAIDs)

• Antibiotics

• Chemotherapy drugs

• Steroids

These drugs may cause inflammation or ulcers in the gastrointestinal lining, resulting in symptoms.

If you suspect your dog’s medication is causing problems, consult your vet—do not stop medications abruptly without professional advice.

Related: Dog diarrhea and scooting (Explained)

Dog Vomiting and Diarrhea but Acting Normal

When a dog has vomiting and diarrhea but is otherwise acting normal, the symptoms may be caused by a mild digestive upset.

Eating spoiled food, getting into rubbish, sudden dietary changes, food intolerance, stress, and intestinal parasites can irritate the digestive tract and trigger both symptoms.

Some dogs continue eating, playing, and behaving normally during the early stages of gastrointestinal illness. However, acting normal does not necessarily mean the problem is harmless.

More serious conditions, including pancreatitis, intestinal infections, poisoning, and intestinal blockages, can initially cause similar symptoms.

Monitor your dog closely and contact your veterinarian if vomiting or diarrhea continues, returns, or worsens.

Blood in the stool or vomit, repeated vomiting, abdominal pain, weakness, or inability to keep water down requires prompt veterinary attention.

Dog Diarrhea and Throwing Up Bile After Eating

If your dog develops diarrhea and throws up bile after eating, it may be experiencing inflammation or irritation of the digestive tract.

Possible causes include gastritis, dietary indiscretion, food intolerance, intestinal parasites, infections, and pancreatitis.

Eating too quickly or consuming rich, fatty, or unfamiliar foods can also trigger digestive upset in some dogs.

The yellow or yellow-green vomit is bile, which may appear when the stomach is empty or after repeated vomiting.

However, vomiting bile after eating alongside diarrhea suggests that the digestive problem may involve more than simply an empty stomach.

If the symptoms happen repeatedly after meals, your veterinarian should investigate the cause, particularly if your dog also develops abdominal discomfort, reduced appetite, or lethargy.

Dog Diarrhea and Throwing Up Bile After Drinking

When a dog has diarrhea and throws up bile after drinking water, it may indicate significant gastrointestinal irritation or a condition preventing normal fluid tolerance.

Gastritis, intestinal infections, pancreatitis, dietary indiscretion, and intestinal obstruction are possible causes.

Repeated vomiting can also leave the stomach empty, making bile more likely to appear in the vomit.

Diarrhea combined with an inability to keep water down increases the risk of dehydration and electrolyte imbalances.

If your dog vomits shortly after drinking, seek immediate veterinary attention rather than repeatedly offering large amounts of water or attempting home remedies.

Weakness, abdominal swelling, repeated unproductive retching, or collapse requires emergency veterinary care.

What To Do If Your Dog Has Diarrhea and Is Throwing Up Bile

If your dog shows both symptoms once and seems fine afterward, it may be a minor issue.

However, if the diarrhea and vomiting bile persist or worsen, it’s important to take action quickly.

Here’s what you can do:

Step 1: Withhold Food (Temporarily)

• Avoid feeding your dog for 12–24 hours to let the gastrointestinal tract rest.

• Always provide fresh water to avoid dehydration.

Step 2: Introduce a Bland Diet

• After fasting, offer a bland diet like boiled chicken and white rice in small portions.

• Gradually reintroduce their regular food over a few days if symptoms improve.

Step 3: Hydration is Key

• Encourage water intake. Use electrolyte solutions if advised by a vet.

• Watch for signs of dehydration like dry gums, lethargy, or sunken eyes.

When to See a Vet 

Seek veterinary care immediately if:

• Diarrhea or vomiting lasts more than 24 hours

• Vomit contains blood or appears coffee-ground

• Diarrhea is bloody or black (tarry)

• Your dog is lethargic or shows signs of pain

• Your dog refuses food and water

• Symptoms occur in a puppy, senior dog, or dog with chronic illness.

Early intervention can make a significant difference, especially if the cause is a serious condition like pancreatitis or poisoning.

Dog Diarrhea and Throwing Up Bile: Treatment

Treatment for a dog with diarrhea and bile vomiting depends on the underlying cause and the severity of the symptoms.

Your veterinarian may perform a physical examination, blood tests, stool testing, and abdominal X-rays or ultrasound to investigate infection, inflammation, pancreatitis, or a possible intestinal blockage.

Treatment may involve fluid therapy to correct dehydration, anti-nausea medication, appropriate dietary management, and targeted medication for parasites or infections when identified.

More serious conditions may require hospitalization or surgery. 

Key Takeaway

Dog diarrhea and vomiting bile are symptoms that shouldn’t be ignored.

While mild cases can result from an empty stomach or minor dietary issues, persistent or severe symptoms may indicate serious conditions such as infections, pancreatitis, or liver disease.

Understanding the underlying causes is key to ensuring proper treatment and recovery.

When in doubt, it’s always best to consult your veterinarian for a thorough evaluation.

By addressing the root cause, managing your dog’s diet, and monitoring for red flags, you can help ensure your dog stays healthy and comfortable.