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Why is My Dog Throwing Up White Foam?

Posted on by Pieper

Seeing your dog retching or throwing up white foam can be alarming. While it’s sometimes harmless, in other cases, it may point to a more serious issue requiring urgent care. Understanding what causes this type of vomiting—and when to take action—can help protect your dog’s health and well-being.

At Pieper Veterinary, our emergency and specialty teams routinely treat dogs for vomiting, nausea, and gastrointestinal distress. This guide explains the top reasons for dogs throwing up white foam, signs to watch for, and when to contact your veterinarian.

What it Means When Your Dog Throws Up White Foam

When a dog throws up white foam, it usually consists of saliva and gastric juices from the upper digestive tract. This foamy or bubbly vomit typically appears when a dog has an empty stomach. Another possible situation may be your dog is coughing up respiratory secretions that appear as white foam. It may happen just once or be an early sign of something more serious.

If vomiting occurs repeatedly or is accompanied by other symptoms, prompt veterinary attention is recommended.

Common Causes of Dogs Throwing Up White Foam

There are many possible causes for this symptom—some mild and others more serious. Below are the most frequent reasons:
1. Empty Stomach or Bile Irritation
When a dog hasn’t eaten for several hours, stomach acid and bile can accumulate , irritating the lining and leading to vomiting, this is called bilious vomiting syndrome. This often occurs in the early morning or late at night.

2. Indigestion or Dietary Upset
Eating fatty foods, spoiled leftovers, or foreign items can cause vomiting. If the stomach is empty, the vomit may appear as bile that is foamy or white.

3. Gastrointestinal Inflammation
Conditions like gastritis or gastroenteritis—often due to infections, parasites, dietary indescretion,chronic conditions like inflammatory bowel disease, toxicities, or adverse drug events—can trigger repeated vomiting, sometimes with mucus or foam.

4. Respiratory Irritation or Kennel Cough
Certain respiratory illnesses may lead to coughing and frothy secretions that resemble vomit. Look for nasal discharge, lethargy, or increased respiratory effort like coughing.

5. Pancreatitis
Triggered by rich or fatty foods, pancreatitis causes inflammation and vomiting. White foam can appear alongside signs like abdominal pain or weakness.

6. Toxin Exposure
Ingesting medications, chemicals, or toxic plants can cause vomiting—often with white foam—and may require emergency care. Call your vet immediately if poisoning is suspected.

7. Bloat
This life-threatening emergency occurs when the stomach twists and fills with gas. Signs include unproductive retching, excessive drooling, and abdominal swelling. Dogs may vomit only foam. Seek emergency care without delay.

When to Call the Vet

Not every case of white foam vomiting requires emergency attention, but contact your vet if your dog shows any of the following signs:

  • Vomiting more than once in 24 hours
  • Lethargy or unresponsiveness
  • Refusal to eat or drink
  • Distended or painful abdomen
  • Unproductive retching more than once
  • Vomiting blood
  • Possible ingestion of toxins or objects

At-Home Care for Mild Cases

If your dog is otherwise healthy and has vomited white foam only once, you can try these at-home care steps:

  • Withhold food for 6 to 12 hours, but provide fresh water
  • Reintroduce a bland diet (boiled chicken and plain rice)
  • Watch for repeat vomiting or behavior changes
  • Avoid fatty treats or table scraps
  • Don’t give medications unless prescribed by your vet

If symptoms return or worsen, call your veterinarian immediately.

Emergency Veterinary Care When Needed

Sometimes, vomiting is just a temporary upset. Other times, it’s a sign of something serious. If your dog keeps throwing up white foam, seems distressed, or won’t eat or drink, don’t delay.
The emergency team at Pieper Veterinary is available 24/7 to provide diagnostics, stabilization, and advanced treatment for urgent conditions. We’re here to help when your dog needs it most.