Four in the morning. That noise. You lie there for a second hoping it’s on the lino and not the rug, and it never is.
Dogs vomit more readily than we do – it’s a species that evolved to eat first and evaluate later, and being able to bring something back up is a useful feature rather than a fault. Most episodes are unremarkable. A few are the first sign of something that needs dealing with within hours.
The distinction almost nobody knows
Vomiting and regurgitation look similar in a dark kitchen and they mean entirely different things.
Vomiting is active. There’s warning – drooling, lip licking, restlessness, a hunched posture – then obvious abdominal effort. What comes up is usually partly digested and often contains yellow or green bile.
Regurgitation is passive. No warning, no heaving. Food simply arrives back, usually undigested, sometimes in a tube shape, often quite soon after eating. There’s no bile because it never reached the stomach.
Regurgitation points at the oesophagus rather than the stomach, and repeated regurgitation deserves proper investigation rather than a bland diet. It also carries a real risk of food going into the lungs, so it’s worth being specific with your vet about which one you’re describing.
The other thing worth knowing here is that neither is a diagnosis. Both are symptoms, and what matters is the pattern around them – which is why keeping a note is more useful than any single episode. A dog with occasional isolated vomiting on a stable routine is a very different case from one who’s been sick three times this fortnight, and daily gut support has a place in the first picture and none at all in the second. If you are using one, the Best Probiotic for Dogs is simply the one with a stated CFU count that he’ll take every day without argument.
What’s in it, and what that means
Yellow or green bile, usually on an empty stomach, often early morning. Common and usually benign.
Undigested food, soon after eating. Ate too fast, ate too much, or exercised straight afterwards.
White foam. Often an empty stomach, occasionally the start of something else.
Fresh red blood. Worth a same-day call.
Something like coffee grounds. That’s digested blood from the stomach, and it means bleeding higher up. Vet, promptly.
Grass. Extremely common and almost never significant on its own.
Anything inorganic – fabric, plastic, bits of toy. He’s told you what he’s been eating, and the next piece may not come back up so obligingly.
The early-morning yellow vomit
Worth its own section because it’s so common and so easily fixed.
Bilious vomiting syndrome happens when the stomach has been empty for too long and bile irritates the lining. Classic picture: a dog who’s sick with yellow foam at five or six in the morning, then eats breakfast perfectly happily and is fine all day.
The fix is usually a small snack last thing at night, or splitting the day’s food into three meals rather than two so the gap overnight is shorter.
If that sorts it within a week, it was almost certainly bilious vomiting. If it doesn’t, it needs looking at.
Motion sickness, which is its own thing
Very common in young dogs and frequently outgrown, because the structures of the inner ear aren’t fully developed until eight or nine months.
The tell is timing. A carsick dog is usually fine getting in and deteriorates once you’re moving, particularly on twisty roads or in stop-start traffic. Drooling comes first, often a lot of it, then lip licking and restlessness, then the main event.
What helps: facing forwards rather than sideways, so he can see where the movement is going. A window cracked slightly. Driving smoothly, because hard braking and sharp cornering are what produce nausea. Not travelling on a completely full stomach, and not on a completely empty one either – a small light meal two or three hours beforehand works better than nothing.
What helps more than any of that: a vet visit. Prescription anti-nausea medication for travel is effective, affordable and a world away from the old sedating travel tablets. Plenty of owners spend years managing something that a single conversation would have solved.
The complication is that sickness creates a fear of the car that outlasts the sickness itself. A dog who felt dreadful in the car at four months may still be frightened of it at four years, long after he stopped being nauseous. Sorting the physical side early prevents the behavioural side entirely.
Common causes
Dietary indiscretion. Something out of the bin, off the pavement, or from the compost heap. By far the most frequent.
Eating too fast. A slow feeder bowl solves a surprising number of these.
Motion sickness, particularly in young dogs.
Infection or parasites.
Sudden diet change.
Medication, especially anti-inflammatories and some antibiotics.
Obstruction. A swallowed object. Repeated vomiting, no appetite, often no stools, a painful abdomen and a dog who is clearly unwell.
Pancreatitis. Often follows a fatty meal. Vomiting, abdominal pain, a hunched posture, sometimes the classic stretched-out praying position.
Kidney or liver disease, in older dogs particularly.
Toxins. Chocolate, raisins, xylitol, antifreeze, slug pellets.
What to do for a one-off, in a well adult dog
Remove food for a few hours – not a full day, just long enough to let the stomach settle. Leave water available.
Then offer small amounts of something bland: a few spoonfuls, then wait an hour, then a few more. Building back up gradually matters more than what you feed.
Back to normal food over two or three days.
Do not give human anti-sickness medication. Do not withhold water. Do not fast a puppy at all.
If he keeps everything down for twelve hours and seems himself, that’s usually the end of it.
When it isn’t a one-off
Ring the vet the same day for repeated vomiting over more than a few hours, vomiting plus diarrhoea, or a dog who can’t keep water down.
Treat as an emergency: blood, or anything resembling coffee grounds. Unproductive retching – trying to be sick and bringing nothing up – particularly with a swollen, hard abdomen, which is bloat and kills within hours. Obvious pain. Collapse or weakness. Pale gums. A known or suspected swallowed object. Any suspicion of poisoning.
Puppies, elderly dogs and small breeds get a much lower threshold. They dehydrate faster and have less in reserve.
The chronic vomiter
A dog who is sick every week or two, has been for months, and is otherwise well.
This gets normalised in a way it shouldn’t. It’s not a personality trait. Common explanations include food intolerance, inflammatory bowel disease, chronic parasites and, in older dogs, kidney or liver disease.
Take a diary to the appointment: dates, times of day, what came up, what he’d eaten, whether it followed exercise. Patterns are far more diagnostic than any single episode and they’re impossible to reconstruct from memory.
Water, and the dog who drinks too fast
A small thing that causes a surprising number of episodes.
A dog who comes in from a walk and empties the bowl in one go will frequently bring most of it straight back up. It looks alarming and it’s almost always mechanical rather than medical – too much, too fast, on a stomach that’s been jolted about.
Offer smaller amounts more often after exercise rather than one large bowl. Let him cool down for a few minutes before he drinks at all.
The same applies to dogs who play hard with a ball and drink between throws. Break the pattern rather than the bowl.
Worth distinguishing from the opposite problem: a dog who has suddenly started drinking far more than usual, across the whole day rather than after exercise. That’s not a vomiting issue and it needs a vet, because increased thirst is an early sign of several treatable conditions.
Grass eating
The theory that dogs eat grass to make themselves sick is largely unsupported. Most dogs who eat grass don’t vomit, and most who vomit weren’t eating grass first.
More likely it’s normal foraging behaviour, or boredom, or they simply enjoy it.
Worth noticing if it’s frantic, sudden and new, or if it comes with other signs. Worth ignoring if he’s grazed the same patch every spring for six years.
Do check what’s been sprayed on it, though – lawn treatments and weedkillers are a real hazard, and grass at the edge of a field may have had something on it.
Keeping a record
The most useful thing you can do for a dog who’s sick more than occasionally, and it takes thirty seconds.
Date, time of day, what came up, what he’d eaten and when, whether he’d exercised, and how he seemed afterwards. Keep it in your phone.
Two or three months of that turns “he’s sick sometimes” into something a vet can work with. Patterns emerge that are genuinely invisible day to day – always early morning on an empty stomach, always the day after a particular chew, always within an hour of a walk.
It also stops the opposite problem, which is a dog who’s been sick more often than anyone realised because each episode was forgotten by the following week.
Prevention, such as it is
Slow the eating down: a slow feeder, a snuffle mat, or scatter feeding.
Split meals into three rather than two, particularly for early-morning sickness.
Don’t feed within an hour of hard exercise, either side.
Keep the diet consistent and make changes over ten days.
Secure the bins, keep the compost heap fenced, and teach a reliable “leave it”.
And keep worming and flea treatment up to date, because parasites are a genuinely common cause and one of the few that’s entirely preventable.
