When your dog is vomiting white foam and not eating, it’s a symptom that can spark concern in even the most experienced dog owner.
While the white foam may look alarming, it’s usually a mixture of saliva, gastric juices, and air from an empty stomach. Combined with refusal to eat, this could signal a range of issues—from mild stomach upset to more serious illnesses.
We outline the common causes to help you understand what’s normal, what’s not, and how to respond, which can help you take quick, informed action.
Dog Vomiting White Foam and Not Eating: Why It Happens
When a dog vomits white foam and stops eating, it’s often due to gastritis, acid reflux, ingestion of irritants, or even respiratory or metabolic conditions. These issues typically cause stomach inflammation or nausea, which leads to the production of foam and a reluctance to eat.
Dog Vomiting White Foam and Not Eating: Common Causes
1. Gastric Irritation or Empty Stomach Syndrome
One of the most frequent reasons a dog vomits white foam and refuses to eat is an empty stomach.
When a dog hasn’t eaten for a while, bile and stomach acid build up, causing irritation and foamy vomiting.
This is especially common in the early morning or late at night.
Dogs with empty stomach syndrome (also known as bilious vomiting syndrome) may be otherwise normal after the episode.
But if the vomiting continues or your dog won’t eat at all, it’s time to take action and consult your vet.
Related: Dog vomiting and not eating (Causes and when to worry)
2. Acid Reflux or Gastroesophageal Reflux Disease (GERD)
Dogs can suffer from acid reflux, just like people. This condition happens when stomach acid flows backward into the esophagus, causing irritation and vomiting white or foamy fluid.
Affected dogs often show discomfort after eating, may lick their lips frequently, and avoid food.
If acid reflux occurs regularly, it can damage the esophagus and cause chronic appetite loss.
A vet may recommend feeding smaller meals more frequently and prescribing medications to reduce stomach acid.
3. Ingestion of Grass, Foam-Producing Substances, or Toxins
If your dog has been eating grass, household cleaners, or other substances, they may vomit white or frothy foam.
Some dogs eat grass to ease digestive upset, which can actually lead to more vomiting if they ingest too much.
Certain soaps or chemicals can also create foamy vomit and pose a toxic threat.
Dogs who vomit foam and won’t eat may be reacting to irritation or nausea from something they swallowed.
Keep an eye out for other signs like drooling, shaking, or lethargy and call your vet if you’re concerned about toxin exposure.
Related: Dog Vomiting White Foam and Not Eating for 2 Days (Here’s why)
4. Kennel Cough or Respiratory Conditions
Respiratory conditions like kennel cough can mimic vomiting, especially if your dog is coughing up white foam.
These episodes are often mistaken for vomiting but may actually be retching or hacking due to throat irritation.
Dogs with kennel cough may avoid food because swallowing aggravates their cough.
While mild cases resolve on their own, more severe respiratory infections may require antibiotics or other treatments.
Look for accompanying signs like nasal discharge, persistent cough, or fatigue.
5. Pancreatitis or Other Digestive Disorders
Pancreatitis—an inflammation of the pancreas—can also lead to vomiting white foam and a complete lack of appetite.
Dogs with pancreatitis typically experience pain, lethargy, and abdominal tenderness, in addition to vomiting.
This condition can be triggered by fatty foods or occur without warning. It’s more common in middle-aged and older dogs.
Diagnosis usually requires blood tests and, in some cases, imaging.
Treatment involves rest, fluid therapy, and a special low-fat diet.
Related: Dog Vomiting Yellow Bile and Not Eating
What to Do If Your Dog Is Vomiting White Foam and Not Eating
If your dog vomits white foam once and seems normal afterward, there’s likely no cause for alarm.
However, repeated vomiting and refusal to eat should not be ignored. Here’s what you can do at home initially:
Withhold food for 8–12 hours to allow the stomach to rest.
Continue to offer small amounts of water or ice cubes to prevent dehydration.
After fasting, offer a bland diet—boiled chicken and plain rice in small portions.
Feed small, frequent meals rather than one large one to reduce acid buildup.
Monitor behavior closely for changes in energy level, breathing, or bathroom habits.
Avoid giving any human medications unless directed by your vet, as many are toxic to dogs.
When to Call or Visit Your Vet
Call your veterinarian if your dog is vomiting white foam and not eating and:
Vomiting continues for more than 12–24 hours
Your dog becomes lethargic, weak, or shaky
You see blood in the foam, vomit, or stool
Your dog shows signs of pain, bloating, or unusual behavior
They have underlying health conditions or are very young or old
Vomiting is accompanied by coughing, diarrhea, or dehydration
A full examination—including bloodwork or imaging—may be needed to diagnose and treat the issue properly.
Related: Dog Vomiting and Not Eating but Drinking Water (When to worry)
Key Takeaway
When your dog is vomiting white foam and not eating, it’s a signal that something is off—even if it doesn’t look severe at first.
Whether the cause is simple stomach irritation or something more complex, prompt attention can ease discomfort and prevent complications.
Trust your instincts, monitor symptoms closely, and reach out to your vet if things don’t improve within a day.
With your care and the right support, your dog has every chance to bounce back.