Why Is My Dog Vomiting?

Vomiting is one of the most common reasons dogs are brought to the veterinarian. While a single episode of vomiting may be due to a  mild stomach upset, repeated vomiting or vomiting accompanied by other signs of illness can indicate a more serious medical condition. If your dog is vomiting repeatedly, cannot keep water down, is lethargic, has abdominal pain, vomits blood, or may have eaten a toxin or foreign objection, seek veterinary attention promptly. 

What causes dogs to vomit?

Vomiting is a symptom rather than a disease. It occurs when the stomach or upper digestive tract becomes irritated or when illness elsewhere in the body triggers the vomiting reflex. 

Common causes include:

• Eating spoiled food or garbage

• Sudden diet changes

• Eating too quickly

• Dietary intolerance

• Foreign object obstruction

• Internal Parasites

• Bacterial or viral infections

• Pancreatitis

• Kidney disease

• Liver disease

• Poisoning

• Heatstroke

• Motion sickness

• Certain medications

Since vomiting has many possible causes, a veterinary examination may be required to determine the underlying problem 

What does the colour of my dog's vomit mean?

The appearance of vomit can provide valuable clues but cannot diagnose the underlying cause on its own. Your veterinarian will also consider your dog's age, medical history, other symptoms, physical examination, and diagnostic test results before determining the underlying problem.

If you are unsure whether your dog's vomiting is serious, it is safest to contact your veterinarian for advice. Early assessment can help identify conditions such as gastrointestinal obstruction, pancreatitis, poisoning, infections, or internal bleeding before they become life-threatening.

Why is my dog vomiting but still acting normally?

Some dogs experience a mild gastrointestinal irritation that resolves quickly.

Possible reasons include:

• Eating too quickly

• Eating grass

• Dietary indiscretion

• Mild gastritis

• Temporary stomach irritation

Close observation at home may be reasonable if vomiting occurs only once and your dog remains: 

• Bright and alert

• Eating normally

• Drinking water

• Energetic

If vomiting recurs or your dog develops other signs of illness, veterinary examination is recommended.

Why is my dog vomiting and refusing to eat?

Vomiting accompanied by loss of appetite is more concerning because it often indicates that your dog feels unwell.

Possible causes include:

• Pancreatitis

• Gastroenteritis

• Intestinal obstruction

• Kidney disease

• Liver disease

• Toxin exposure

• Severe inflammation

Dogs that continue vomiting or refuse food for more than 24 hours should be examined by a veterinarian. 

When should I bring my dog to the veterinarian immediately?

Seek veterinary attention as soon as possible if your dog has any of the following:

• Vomits more than once

• Cannot keep water down

• Vomits blood

• Has black or coffee-ground vomit

• Has severe diarrhoea

• Appears weak or collapsed

• Has difficulty breathing

• Has a swollen or painful abdomen

• Is continuously trying to vomit but nothing comes up

• May have eaten a toxic substance

• May have swallowed a toy, bone, sock or foreign object

Young puppies, senior dogs, and dogs with chronic illnesses should be assessed sooner, as they are more vulnerable to dehydration and complications.

Could my dog have eaten something it shouldn't?

Dogs frequently investigate their environment by licking, chewing or swallowing inapproiate objects 

Common examples include::

• Socks

• Toys

• Bones

• Corn cobs

• Plastic

• String

• Food packaging

Foreign body obstruction is a potentially life-threatening emergency and often requires imaging and surgery.

Vomiting after ingesting chocolate, grapes, xylitol containing products or household chemical should be treated as an emergency. 

How will a veterinarian determine the cause?

Your veterinarian will begin with a physical examination and discuss your dog’s recent history including diet, access to toxins, medication and the pattern of vomiting. 

Depending on the findings, your veterinarian may recommend:

• Blood tests

• Faecal examination

• X-rays

• Ultrasound

• Urinalysis

• Specific infectious disease tests

• Endoscopy (in selected cases)

These tests help to identify the underlying causes of vomiting and guide the most appropriate treatment. 

How is vomiting treated?

Treatment for vomiting depends on the underlying cause.. 

The table below outlines some of the more common causes of vomiting in dogs and the treatments that may be recommended. Every dog is different, and treatment will vary depending on the diagnosis, severity of illness, age, and overall health of your pet.

Early diagnosis allows treatment to begin sooner and often leads to better outcomes.

Should I monitor my dog’s vomiting or visit the veterinarian?

Not every dog that vomits requires immediate veterinary treatment. A single episode of vomiting in an otherwise healthy dog may be resolved without medical intervention. However, repeated vomiting, blood in the vomit, signs of dehydration, or changes in your dog's behaviour can indicate a more serious condition that requires prompt veterinary attention.

Use the guide below as a general reference to help determine whether it may be appropriate to monitor your dog at home or arrange a veterinary examination. If you are ever unsure, it is always safest to contact your veterinarian for advice. This guide is intended as general advice and should not replace a veterinary examination.

Vomiting is one of the most common reasons dogs visit a veterinary clinic. While many cases are mild and self-limiting, others require urgent treatment. If your dog is vomiting repeatedly, appears unwell, or you are unsure about the cause, arranging a veterinary examination is the safest course of action. 

Frequently Asked Questions

1. Can I give my dog human anti-vomiting medicine?

No. Many human medications can be unsafe or toxic for dogs. Only give medications that have been prescribed or recommended by a veterinarian.

2. Should I stop feeding my dog after vomiting?

This depends on your dog's age, medical history, and the cause of vomiting. Puppies and dogs with ongoing vomiting should not have food withheld without veterinary guidance. Follow your veterinarian's recommendations on feeding after a vomiting episode.

3. Can stress cause vomiting?

Stress or anxiety can contribute to digestive upset in some dogs, but persistent or recurrent vomiting should never be assumed to be behavioural until medical causes have been ruled out.