Dog vomiting: reading the pattern, and when it is an emergency

Quick answer

Most vomiting dogs are fine by morning. The job is recognising, quickly, the ones that are not.

Vomiting in dogs is common, and most single episodes in a bright, otherwise normal adult dog need nothing more than a short pause in feeding and a careful eye. That is not the useful part of the answer.

The useful part is the small set of patterns that mean the dog needs to be seen now: retching that produces nothing, blood, no faeces with a painful abdomen, an unspayed bitch a few weeks after a season, a puppy, or a dog that cannot keep water down.

• Work out first whether it is vomiting or regurgitation. They point to completely different organs and different risks.
• Repeated unproductive retching with a swelling abdomen is a surgical emergency in minutes, not hours.
• Photograph what came up. It is more useful to the vet than any description.
• A dog that cannot keep water down is dehydrating, and small dogs and puppies do it fast.
• Do not give human anti-sickness or painkiller medication. Several are directly toxic to dogs.

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Repeated retching that brings nothing up, in a restless dog with a distending, drum-tight abdomen, is gastric dilatation and volvulus until proven otherwise.

The stomach has filled with gas and rotated, sealing both ends. Blood supply to the stomach and spleen is cut off and the dog goes into shock. Deep-chested breeds are at highest risk but it happens in others.

Drive to an emergency vet immediately and phone on the way so they are ready. Do not wait to see whether it passes, and do not try to make the dog vomit.
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Decide in 60 seconds

Vomiting or regurgitation: the distinction that changes everything

Vomiting.

An active, coordinated reflex. There is a build-up first: drooling, repeated swallowing, lip licking, pacing, seeking out grass. Then the abdomen visibly heaves, the dog braces, and material comes up with effort.

What comes up is usually partly digested, often mixed with bile, and smells acidic. It can be produced some hours after eating.

Vomiting means the stomach, the small intestine, or a systemic signal reaching the brain's vomiting centre. That includes toxins, kidney disease, liver disease, pancreatitis and hormonal disease as well as anything wrong with the gut itself.

Regurgitation.

Passive. There is no warning, no heaving and no abdominal effort. The dog lowers its head and material simply falls out, often in a tubular shape, usually undigested, often shortly after eating or drinking, and often when the head goes down or the dog gets excited.

Regurgitation means the oesophagus is not moving material into the stomach. Causes include megaoesophagus, inflammation from acid reflux, a stricture after a previous injury or anaesthetic, a vascular ring anomaly in a young puppy that regurgitates from the moment it starts solid food, and neuromuscular disease such as myasthenia gravis.

The reason this matters urgently is aspiration. Material sitting in the oesophagus can be inhaled, causing pneumonia. A regurgitating dog that develops a cough, fast breathing, a fever or lethargy needs to be seen without delay.

Two more things that are neither.

A cough that ends in a gag and a mouthful of white froth is respiratory, not gastric. Owners frequently report this as vomiting, which sends the consultation in the wrong direction.

Retching that produces nothing at all, repeatedly, is the GDV pattern described above and is its own category.

Reading the pattern

A single episode, dog otherwise normal.

Most commonly dietary indiscretion: something scavenged, eaten too fast, or too rich. If the dog is bright, wants to drink, has normal gums and passes normal faeces, home observation is reasonable.

Repeated vomiting over hours, dog getting flatter.

This is no longer a watch-and-wait situation. Repeated vomiting produces fluid and electrolyte loss on top of whatever caused it.

Vomiting yellow foam or bile, typically overnight or first thing.

Bilious vomiting syndrome. The stomach has been empty for a long stretch and bile refluxing into it irritates the lining. It is uncomfortable rather than dangerous, and it usually improves by shortening the overnight gap: a small late meal, or splitting the daily ration into more meals. Changing the timing works better than changing the food.

Vomiting shortly after every meal, food undigested.

Consider whether this is actually regurgitation. If it truly is vomiting, eating too fast is a common cause and a slow-feeding bowl or scatter feeding helps. Persistent post-meal vomiting with weight loss is not a feeding problem and needs investigation.

Chronic, intermittent vomiting with weight loss.

This is the pattern that gets tolerated for months and should not be. It covers chronic inflammatory enteropathy, chronic pancreatitis, kidney disease, liver disease, hypoadrenocorticism and neoplasia. Weight loss is the line that separates a nuisance from a disease.

Vomiting with a hunched or prayer posture.

Front end down, rear end up. This is a dog trying to relieve abdominal pain, and it is classic for pancreatitis, often after a fatty meal. Miniature schnauzers, Yorkshire terriers and cocker spaniels are among the breeds seen more often.

Vomiting plus increased thirst and urination.

Points away from the gut and towards kidney disease, diabetes and its ketoacidotic crisis, or pyometra in an unspayed bitch.

Vomiting plus weakness or collapse, sometimes waxing and waning over weeks.

Hypoadrenocorticism, also called Addison's disease, is known as the great imitator for exactly this reason. It is treatable and it is missed because the dog keeps seeming to get better.

The checks to do at home

Gum colour and moisture take ten seconds and tell you more about urgency than the number of vomits does.

Gums.

Lift the lip. Healthy gums are moist and pale pink, and a pressed spot refills within about two seconds.

Tacky or dry gums indicate dehydration. White or very pale gums suggest bleeding or shock and are an emergency. Brick red gums suggest a systemic inflammatory process. Yellow suggests liver disease or red cell breakdown.

Abdomen.

Look at the silhouette from the side and from above. A belly that is visibly enlarging over minutes to an hour is an emergency. Gently feel: a rigid, board-like or exquisitely painful abdomen is a serious finding.

Faeces.

Ask whether anything is being passed at all. Complete absence alongside vomiting raises obstruction. Black, tarry stool means digested blood from further up the gut. Bright red blood is lower down.

Under the tongue.

If a dog has swallowed string, thread, tinsel or a stocking, one end can anchor around the base of the tongue while the rest travels on, sawing through the intestine. Look under the tongue. If you find a thread, do not pull it. That is an emergency.

Weight.

Weigh the dog. It gives the vet a hydration reference and, in a chronic case, the single most important trend.

What came up.

Photograph it on a plain surface with something for scale before you clear it away. Colour, texture, presence of food, foreign material, blood, worms or plant matter all change the interpretation.

What to do at home for a dog that does not need a vet yet

Getting the carrier, towels and paperwork together early costs nothing if the dog recovers and saves time if it does not.

Toxins worth knowing by name

Chocolate, where the toxic compound is theobromine and dark chocolate carries far more of it than milk chocolate.

Xylitol, sold in some regions as birch sugar and found in sugar-free gum, some peanut butters, baked goods and some medicines. It causes a rapid collapse in blood sugar and can cause liver failure. The regional naming matters, because an owner scanning an ingredient list for "xylitol" may miss "birch sugar".

Grapes, raisins, sultanas and currants, which cause kidney injury in some dogs and not others, at doses that are not predictable. Treat any ingestion as significant.

Onions, garlic, leeks and chives, raw, cooked, dried or powdered, which damage red blood cells.

Human medications, particularly ibuprofen and other anti-inflammatories, paracetamol, and antidepressants.

Rodenticides, where the type matters enormously: anticoagulant products cause bleeding days later, while cholecalciferol products cause kidney failure. Bring the box.

Antifreeze, which tastes sweet, is rapidly fatal, and where treatment is time-critical to the point that hours count.

Macadamia nuts, and mouldy food or compost, which can cause tremors and seizures.

If any of these is a possibility, the packaging or a photograph of it is the most valuable thing you can bring.

What never to do

Do not give human anti-sickness tablets, anti-diarrhoeals or painkillers. Ibuprofen, aspirin and paracetamol all cause serious harm in dogs, and anti-diarrhoeals can be dangerous in some breeds carrying the MDR1 mutation, which is common in collies and related herding breeds.

Do not induce vomiting on your own initiative. It is actively harmful if the substance was caustic or petroleum-based, if the dog is already vomiting, if it is drowsy or fitting, or if it is a flat-faced breed at risk of inhaling the material. Salt water is not a safe emetic and can cause dangerous sodium levels.

Do not pull on a string or thread found under the tongue or at the anus.

Do not withhold water from a vomiting dog. Restrict the volume per drink, not the access.

Do not fast a puppy, a toy breed or a diabetic dog. Blood sugar falls quickly and that becomes the emergency.

Do not assume grass eating caused it. Dogs eat grass for many reasons, and a dog that seeks out grass is often already nauseous rather than made nauseous by it.

When to get help

Keeping water down, returning appetite and normal faeces are the three things that say it is over.

Go now, out of hours if necessary:

• Unproductive retching with a distending abdomen
• Blood in the vomit, fresh or looking like coffee grounds
• Pale, white, blue or yellow gums
• Collapse, weakness or inability to stand
• A tense, board-like or severely painful abdomen
• No faeces passed alongside repeated vomiting
• Known ingestion of a toxin, a foreign object, or a string-like item
• A puppy, or a very small dog, vomiting repeatedly
• An unspayed bitch within a couple of months of a season

What the vet will ask for.

How many episodes, over what period, and the timing relative to meals. Whether it is vomiting or regurgitation, described by what the dog's body did rather than what came out.

What the material looked like, which is why the photograph matters. Whether water is staying down. Whether faeces are being passed, and what colour.

Appetite, thirst, energy, and current weight against recent weights.

Everything the dog has access to: bins, compost, the garden, chews, toys that may have lost pieces, human medication, and anything new in the last few days.

For a bitch, whether she is spayed and the date of her last season. For any dog, current medications including anti-inflammatories, and the date of the last worming and flea treatment.

Travel history, because the infectious and parasitic causes of vomiting differ substantially between regions, and a dog that has recently moved country brings a different differential list with it.