Gastroenteritis in dogs: What do I need to know?

Gastroenteritis in dogs might sound worrying, but it’s actually quite common. In this quick guide, we’ll walk you through the causes, symptoms, treatment options and recovery process – so you’ll know when to take it seriously, and why, with prompt care, there’s usually no need to panic.

What is gastroenteritis in dogs?

Let’s break down the word: 

• gastro refers to the stomach,
• entero to the intestines, and
• -itis means inflammation

So, gastroenteritis quite literally means inflammation of the stomach and intestines.

It’s a label for a group of symptoms – not a diagnosis in itself. In fact, most cases of vomiting and diarrhoea in dogs fall under the umbrella of gastroenteritis. Find out about other common stomach problems in dogs. 

If there’s any blood in your dog’s vomit or diarrhoea, it may be classed as haemorrhagic gastroenteritis. In more serious cases, your dog’s poop might even look like raspberry jam – and it definitely won’t smell pleasant.

Gastroenteritis in puppies 

Puppies deserve a special mention because they’re more sensitive to dehydration and longer periods without food. They explore the world with their mouths, their immune systems are still developing, and their vaccination courses may not yet be complete. This means vets take gastroenteritis in puppies more seriously. It’s often best to contact your vet straight away if you think your puppy has gastroenteritis. 

One complication worth mentioning is intussusception. Normal gut contractions can become uncoordinated when there is severe inflammation, and one section of intestine can telescope into another, affecting the blood supply. Although uncommon, it is seen more often in young animals and is a surgical emergency.

Symptoms of gastroenteritis in dogs

The signs of gastroenteritis can vary in severity, but here are the most common symptoms to look out for:

• Vomiting – Once, twice or multiple times, containing food, water, yellow bile or blood. Fresh blood looks pink or red, while digested blood can look like coffee grounds.
• Diarrhoea – Soft, liquid, watery, mucousy or bloody. It may be explosive or look like raspberry jam when there is a significant amount of blood.
• Noisy tummy – Your dog's stomach is gurgling, bubbling, popping sounds or excessive gas
• Eating and drinking less – Interest in food and water may reduce or stop. 
• Abdominal pain – Your dog may be tense, reluctant to be touched or adopt a hunched posture
  
• Lack of energy – Lethargy or sleeping more than usual.

When is gastroenteritis an emergency?

Healthy adult dogs with uncomplicated gastroenteritis may begin to recover within 12-24 hours, but there are some red flags that mean it’s time to call your vet:

• Repeated or persistent vomiting
• Blood in the vomit or mixed into the diarrhoea
• Severe or worsening diarrhoea
• Lethargy, weakness or collapse
• Abdominal swelling or severe pain
• Suspected toxin or foreign body ingestion
• High-risk dogs, such as puppies or those with existing health conditions
  

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What causes gastroenteritis in dogs?

There are lots of possible causes. Some clear up quickly on their own, while others need urgent care:

• Infections – Bacterial or viral, for example, parvovirus.
• Worms and parasites
• Dietary indiscretion – Scavenging things that could loosely be described as ‘food’, including spoiled items and rubbish.
• Foreign bodies – For example, toys, bones, socks and string.
• Toxins – For example, plants, human food, medications and chemicals.
• Breed predisposition – Some small breeds are prone to haemorrhagic gastroenteritis.
• Other conditions – Liver, kidney, pancreatic disease, hormone imbalances or cancer.
• Medication side effects – Some medications may upset the stomach or intestines, particularly when first started.
• Intestinal obstruction or twisting – Blockages to gastrointestinal contents or blood flow often have more severe symptoms and require surgery.

How long does gastroenteritis last in dogs?

In uncomplicated cases, gastroenteritis often begins to improve within 24–48 hours. Vomiting usually settles first, while diarrhoea may take several days to dry up fully.

During recovery, your pup's energy levels, appetite, and overall demeanour should gradually improve. However, it's important to remember that some cases will not get better without veterinary treatment. Problems such as intestinal blockages, toxin exposure, or severe infections require prompt intervention. A dog whose vomiting or diarrhoea has stopped but is becoming weaker, quieter, or less responsive is not recovering normally and could be at risk of complications. 

Is gastroenteritis in dogs contagious?

A few causes of gastroenteritis are contagious and can spread to other dogs, and in some cases, humans (known as zoonotic diseases). This is why good hygiene is essential if your vet has given you the OK to care for your dog at home:

• Isolate your pup in an easy-to-clean area to limit contact with other pets and reduce the spread of the infection on surfaces.
• Wash your hands thoroughly after handling your dog, food bowls or cleaning up accidents.
• Avoid close contact between your dog and young children or immunocompromised people during recovery.
• Clean and disinfect bowls, bedding and toys regularly to prevent the spread of germs. 
  

Gastroenteritis treatment in dogs

Treatment for gastroenteritis aims to address the underlying cause, control symptoms, and manage any complications such as dehydration or pain.

1. Veterinary examination

Your vet will assess your dog’s hydration status, level of pain, overall condition and check for more serious signs such as shock or abdominal discomfort.

2. Investigating the cause

Further tests may be recommended to rule out more serious underlying causes and complications. These can include blood tests, faecal analysis, and imaging such as X-rays or ultrasound.

3. Treatment in clinic

Treatment always depends on the suspected cause and severity of symptoms, and may include:

• Anti-sickness medication
• Gut protectants or binding agents
• Fluids, either under the skin, into a vein, or as oral support
• Antibiotics, if a bacterial infection is suspected or confirmed
• Worming treatment, if parasites are involved
• Surgery, in cases of obstruction or other serious intestinal problems
• A highly digestible, low-fat diet in small, frequent meals
  

4. At-home care (if appropriate)

If your vet feels your dog is well enough to recover at home, they may recommend:

• A short period of rest for the gut, followed by gradual reintroduction of food.
• A bland diet such as boiled chicken or egg with white rice.
• Fresh water offered frequently, alongside any recommended electrolyte solution.
• Small, regular meals rather than large portions to reduce the risk of further vomiting.
  

Dog gastroenteritis recovery time

Recovery time depends on how severe the episode was – and whether there’s an underlying cause that still needs attention. The good news? The gut renews its lining quickly, and most dogs bounce back well with the right care.

Recovery might take longer if:

• Your dog has lost a lot of weight
• A long course of antibiotics is needed
• Surgery was involved
• Your dog has ongoing health concerns
  

It can take several weeks to fully restore a healthy gut microbiome. A good-quality diet, along with probiotic or prebiotic supplements, can help rebuild gut resilience.

Is gastroenteritis in dogs fatal?

In most cases, gastroenteritis isn’t life-threatening – especially when treated early. But severe or untreated cases can become serious, particularly for:

• Puppies or senior dogs
• Dogs with existing health concerns
• Cases involving toxins, parvovirus or surgical emergencies
• Dogs who don’t receive treatment soon enough
  

It’s usually not the gastroenteritis itself that poses the biggest risk, but the underlying cause. A prompt veterinary diagnosis gives your dog the best chance of a full recovery.

How to prevent gastroenteritis in dogs

While not every case can be prevented, there’s plenty you can do to help reduce your dog’s risk of gastroenteritis:

• Feed a high-quality, balanced diet
• Make dietary changes gradually over 5-7 days
• Be cautious with new treats, table scraps and raw or fatty foods
• If your dog tends to gulp down anything on walks, consider using a basket muzzle
• Keep vaccinations and worming up to date
• Puppy-proof your home to limit access to harmful substances or objects

Supporting gut health

For dogs prone to tummy troubles – or those with health conditions that affect digestion – there are a few extra ways you can help support a healthier gut in your dog:

• Try a digestive supplement such as a dog probiotic
• Choose easily digestible food with limited ingredients
• Ask your vet about sensitive or prescription diets tailored to your dog’s needs.