Triage

What the Vomit Is Telling You

When to worry about your dog or cat, and when to wait for morning. A CVT-edited triage ladder that moves you from panic to a clear decision.

Rachel Howland, CVT (ret.)

Updated Apr 22, 2026 · 10 min read · Edited for Veta

Your dog threw up twice in an hour. It's 10:47pm. You have a phone in one hand and a Labrador on the couch, and you're trying to figure out whether this is a call-the- clinic-now problem or a call-in-the-morning problem. You are in the right place.

Here's the decision you're actually making: right level of care, right window. Not faster than necessary. Not slower than safe. What follows is a three-tier ladder built out of ten years of triaging dogs and cats over the phone and on the floor, checked against the American Veterinary Medical Association's 2024 owner emergency-preparedness policy and the Merck Veterinary Manual, the reference textbook clinicians use. I'll name the scenarios that belong on each rung and tell you what the tech on the other end of the phone actually needs to hear when you call.

Owners overshoot in both directions, and the undershoot is almost always worse than the overshoot. If you're going to err, err toward the call.

The three-tier ladder, in order

Most triage frameworks in the vet-school literature, from the Cornell College of Veterinary Medicine owner-education series to the AVMA's 2024 owner emergency-preparedness policy, organize around the same three rungs. Go now. Today. Watch and log. Everything else is specifics.

Go now: the emergency tier

These are the bright-line presentations that mean you stop reading this page and drive. You don't wait for the regular clinic to open. You call the nearest ER on the way so they can prepare a room. If your regular vet is open and fifteen minutes closer, they'll triage you in the door and send you on if they can't handle it.

The tier-one red flags in dogs and cats, per the Merck Veterinary Manual's emergency triage section: inability to keep water down paired with visible weakness, gums that are pale, gray, blue, or brick red, a belly that is distended and tight to the touch, any breathing that looks labored at rest (mouth open, flared nostrils, a chest that heaves more than it rises), collapse or refusal to stand, and any seizure that lasts more than two minutes or happens a second time inside twenty-four hours. Add to that list: known ingestion of a confirmed toxin (chocolate above a size-weight threshold, grapes or raisins in any amount, xylitol in any amount, NSAIDs not prescribed for the pet, antifreeze, rodenticide). These are not wait-and-see situations. The ASPCA Animal Poison Control Center and the Pet Poison Helpline, a 24/7 service staffed by veterinary toxicologists, exist specifically so you can get a tox-screening call going while you're driving.

A note specific to cats: if your male cat is straining in the litter box and has not urinated in twenty-four hours, go now. Urethral obstruction in male cats is a tier-one emergency and the window is narrow enough that the drive itself matters. Female cats block less often but it still happens. The sign is the same one either way: repeated unproductive trips to the box.

Today: the same-day visit tier

This is the hardest rung to read correctly, because it covers the territory between “this could wait until tomorrow if it had to” and “you're in my waiting room in an hour.” The honest rule I give owners on the phone: if you're asking whether it's a same-day visit, it probably is one. Same-day visits are the visits you want today, not tomorrow.

The patterns that put a scenario on this rung: persistent vomiting or diarrhea without the tier-one red flags (so gums are pink, pet is still drinking, no belly distension), a limping dog who won't put weight on a leg and can't settle, any new mass that wasn't there a week ago, an ear that's clearly painful on palpation, a cat who hasn't eaten in twenty-four hours, a dog whose breathing rate at rest (counted when they're asleep) is over thirty-five per minute. Thirty-five is the number general practice uses to move a case from monitor-at-home to same-day exam, tracked over three readings in a healthy adult dog (AAHA, 2024 canine wellness recommendations). The count itself is small work: watch a sleeping chest for fifteen seconds and multiply by four.

Here's the move I wish every worried owner made by reflex. Call the clinic and ask. That's what the phone call is for. The receptionist will hand you to a tech, the tech will ask five or six questions, and the tech will either book you a slot inside ninety minutes or name the signs that would bump you up a rung. The call itself costs nothing. Most clinics have a triage line for exactly this reason.

Watch and log: the monitor-at-home tier

The reassurance rung. Most of the things that scare you at 10pm actually live here, and this is the rung where your notebook becomes the thing the next vet visit is built on. Isolated episodes. One vomit, one missed meal, one normal stool afterward, an otherwise bright and curious animal. A dog with a soft stool after a table scrap. A cat who coughed up a hairball and is now asking for dinner.

What watchful waiting actually means in practice: you take a set of baseline observations right now, you repeat them every two to four hours for the next twelve, and you write the numbers down. Water intake in ounces, rough estimate. Urinations, counted. Temperature if you can get one rectally (101 to 102.5 is normal in dogs and cats). Gum color and capillary refill (press a finger on the gum, release, count the seconds until the pink comes back; under two seconds is normal). Resting respiratory rate. Appetite at the next normal meal window.

The intake notes we loved getting at the Albany clinic were the ones that told us what time, how much, and whether the dog ate afterward. The ones that slowed us down were the ones that said “he's been acting off since yesterday.” Specificity is a gift to whoever takes the case next, including your vet, including you tomorrow morning trying to remember what happened at 7pm.

Ten specific scenarios, placed on the ladder

Concrete cases that come through clinic phones most nights of the week. I've placed each on the right rung and walked through the clinical reasoning the way I'd walk a new tech through it.

Dog vomited once this morning, ate dinner normally, acting fine.

Watch and log. Single episodes in bright, eating, drinking adult dogs resolve on their own more than eighty percent of the time, per Merck's acute gastroenteritis overview. Take a temperature if you've got a thermometer handy. Skip the next meal. Offer water in small amounts. Normal food tomorrow if nothing else changes. Call if a second episode shows up or if the next stool is abnormal.

Kitten vomited four times in six hours and is hiding under the bed.

Go now. Kittens dehydrate fast, and hiding is a cat-specific cue that means they feel worse than they can show you. Repeated vomiting in a pet under six months is an emergency presentation until proved otherwise; the Cornell Feline Health Center materials are the ones I trust on this and they read the same way. Call the ER on the way.

Senior dog with chronic kidney disease vomited bile at 5am.

Today, and often same-morning. Yellow bile vomiting in a CKD dog can mean gastric acid overflow from an empty stomach, or it can mean uremic gastropathy from declining kidney function, and the two paths are different. Call your regular vet at open. If you don't have an appointment by noon, push. A chronic-care animal with a new symptom isn't operating on a healthy dog's clock.

Dog ate half a chocolate bar thirty minutes ago.

Go now, or call Pet Poison Helpline first. Chocolate toxicity is dose-dependent by body weight and by type (dark and baker's chocolate carry much more theobromine than milk chocolate). Pet Poison Helpline will run the calculation over the phone for $85 and send your clinic a case number so treatment starts faster when you arrive. Induce vomiting only if they tell you to, never on a hunch.

Cat is breathing with her mouth open on the couch.

Go now. Open-mouth breathing in a cat that isn't visibly panting from heat or exertion is a tier-one emergency, full stop. Feline asthma, congestive heart failure, pleural effusion, hypertrophic cardiomyopathy (a thickening of the heart muscle, often called HCM) all present this way. An open-mouth breathing cat needs oxygen and a radiograph inside the hour — the ACVIM's 2022 feline cardiomyopathy consensus statement is explicit about the hour, and so are the ER docs I've worked with.

Puppy has soft stool after we gave her a piece of pizza crust.

Watch and log. Dietary indiscretion in puppies is extremely common and usually self-limiting over twenty-four hours. Small bland meals, water available, normal stool by tomorrow is the expected path. The scenarios that would bump this to a same-day visit: three or more soft stools in twelve hours, any blood, lethargy, or a puppy that refuses the next meal.

Dog is scratching at his ear and it smells bad.

Today or tomorrow morning. Bacterial or yeast ear infection almost always. Not an emergency unless the dog is shaking his head violently enough to cause an aural hematoma (a blood blister in the ear flap), which is painful and needs drainage. For uncomplicated ear infections, a same-day exam gets you a culture-based medication instead of a guess.

Senior cat has lost weight over the last three months and is eating more than usual.

This week, not this hour. The pattern is classic for hyperthyroidism, early diabetes, or GI disease, and each has a specific bloodwork workup. Those three together account for the majority of senior-cat weight loss with preserved appetite (Merck Vet Manual, senior feline chapter). Book the appointment, ask for a senior chemistry panel plus T4 and urinalysis, and bring a three-month weight log if you have it.

Dog is limping after the dog park, will still eat and walk.

Watch and log, with a twelve-hour horizon. A soft-tissue strain in an otherwise sound dog often resolves with rest and shortened walks. What would move it up: non-weight-bearing on the leg for more than two hours, obvious swelling, a yelp when the joint is touched, or any sign of a puncture wound. Cruciate ligament tears look like “won't settle” more than “won't walk,” and they earn a same-day exam.

Dog found chewed-up bottle of ibuprofen, unclear how many pills.

Go now. NSAID toxicity in dogs causes acute kidney injury and GI ulceration, and the dose threshold is low enough that unknown-ingestion is a treat-as-worst-case situation. Per the FDA's Center for Veterinary Medicine adverse-event database, ibuprofen is one of the most common accidental household toxins in dogs, and early decontamination (induced vomiting, activated charcoal) inside the first two hours dramatically changes the outcome. Call the ER on the way.

Before you call, or before you go

When you call the clinic, the first three questions the tech will ask are your pet's name, what is happening, and what you have tried. Having the rest of this list ready shaves five minutes off the triage call and more off the visit.

Current weight, ideally from a recent visit.
Current medications with doses, including flea and tick preventive, heartworm preventive, and any supplements.
Known allergies or adverse reactions from past visits.
The time and character of whatever started the worry (time of first vomit, what it looked like, what happened in the four hours before).
Anything new in the household in the last forty-eight hours: new food, new plant, new medication in the house at ground level, houseguests, stressful events.
A photo or bagged sample of the vomit or stool if there's anything unusual about its color or contents.
Resting respiratory rate (breaths per minute, counted while the pet is asleep or deeply resting).
The name and number of your regular vet so the ER can forward records after the visit.

If you're going to the ER with a suspected toxin, bring the package. The label is worth more to the toxicologist than a guess. Per the ASPCA Animal Poison Control Center, product name plus active ingredient plus rough dose is the minimum data set for a treatment decision.

When in doubt, call the clinic

The tech picks up the phone, asks your pet's name, asks what's happening, asks what you've tried. The whole exchange takes three or four minutes. On the other end of it you have a real recommendation from a person with clinical training, made specifically about your pet, not a generic triage tree. The tech doesn't mind the call. Triage over the phone is part of the job. The only thing that wastes their time is not calling.

If the symptom resolves on the drive over, you've still done the right thing. A vet exam that turns up nothing is a free baseline for every future visit. A vet exam that catches something early is the whole reason to make the call.

If you want to keep reading

The ladder above is the decision frame. The specifics live a click away. The emergency vet guide walks through ER vs. regular clinic and how to prepare before you leave the house. The symptoms library goes symptom by symptom on each of the scenarios above. The conditions library picks up with the named diagnoses the scenarios eventually point at. And the chronic condition playbook is for pets whose triage baseline is already shifted by an existing diagnosis.

Questions worried owners ask at the edge of triage

When is vomiting in a dog actually an emergency?

Go now if the vomiting is repeated and projectile, if your dog can't keep water down for more than a few hours, if the belly looks distended or feels drum-tight, if the gums are pale or gray, or if the dog is weak enough to struggle standing. Per the Merck Veterinary Manual, these are the presentations that map to gastric dilatation and volvulus, obstruction, pancreatitis, and toxin ingestion, and the window where intervention changes the outcome is narrow. Call the clinic on the way there so they're ready when you arrive.

How long can I wait before calling the vet about vomiting?

A single episode of vomiting in an otherwise bright, eating, drinking adult dog is usually a four-hour watchful-waiting window. Two episodes in twelve hours, any diarrhea on top, any lethargy, and you're inside the same-day call tier. Puppies under four months, seniors with any chronic diagnosis, and any cat that has vomited more than twice in a day are outside the watchful-waiting window entirely. Call the clinic. Triage over the phone is part of the job.

Will a little chicken and rice help my dog feel better?

Sometimes, and only after the vomiting has actually stopped. A bland-diet approach has a modest evidence base in mild acute gastroenteritis, per a 2020 Cornell clinical-nutrition review, but feeding a dog who is still actively vomiting guarantees another round. The useful move is a twelve-hour water-only stretch, then small amounts of a bland protein and rice blend every two to three hours, then normal food over the next day. If a second round of vomiting shows up after you reintroduce food, stop and call.

Can I give my dog Pepcid or Pepto-Bismol at home?

Famotidine, the active ingredient in Pepcid, is dosed in Plumb's Veterinary Drug Handbook 10th edition for dogs, and a lot of general practitioners will clear owners to use it at a vet-set dose for chronic acid-reflux cases. Pepto-Bismol contains bismuth subsalicylate, which the FDA CVM and Merck both flag as risky for cats outright and dose-dependent in dogs. The dose your vet set is the dose for your pet. If this doesn't match what's on your bottle, the bottle wins. Call the clinic and ask before the first dose.

What should I tell the vet when I call about vomiting?

The tech picking up the phone needs four things: your pet's name and species, how many times they've vomited and over what stretch, the color and consistency (yellow bile, undigested food, coffee-ground dark, fresh red), and whether anything unusual happened in the last forty-eight hours (new food, new medication, potential toxin, stress). Your pet's weight, age, and any chronic diagnoses round it out. Write this down before you dial. A vomit log the clinic can read in fifteen seconds is worth more than the same details narrated at an appointment.

Why does my cat throw up so often, and when is it too much?

Cats vomit more readily than dogs because of how their stomach sits and how they groom, and a once-a-month hairball in an otherwise healthy adult cat is closer to normal than to alarming. What isn't normal: weekly vomiting, vomiting that shifts from hairball to bile or undigested food, any vomiting paired with weight loss, and any vomiting in a senior cat. Per the ACVIM 2022 consensus statement on feline chronic enteropathy, frequent vomiting is one of the most underreported signs of inflammatory bowel disease and small-cell lymphoma in cats, and it earns a workup rather than a shrug.

Should I bring a sample of the vomit or stool to the clinic?

Yes, and it's the kind of thing techs thank owners for. Bag the sample in a sealable plastic container or zip bag, refrigerate if there'll be any delay, and label it with the time. Color and consistency matter diagnostically: yellow-green bile, coffee-ground dark (which means digested blood and is its own red flag), frank red blood, black tarry stool. Photograph it before bagging so you have a record the clinic can view on your phone if the sample itself doesn't survive the drive.

How much does an emergency vet visit for vomiting usually cost?

In most US metros as of 2026, a walk-in emergency exam runs $150 to $250 before any diagnostics. Baseline bloodwork and radiographs add roughly $400 to $900. If your pet needs fluids and anti-nausea injections and goes home the same evening, the realistic total is usually $600 to $1,400. Hospitalization for obstruction or suspected pancreatitis climbs from there into the $2,000 to $5,000 range. The honest framing is that the exam fee alone is often worth it for the call you get to stop making at 11pm.

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About the author

Rachel Howland, CVT (ret.)

Rachel Howland, CVT (ret.), spent a decade in clinic: seven years in a mixed practice in upstate New York, then three on the internal-medicine floor at Angell Animal Medical Center in Boston. She left practice in 2017 and has written about small-animal health since. She lives in Somerville with Juno, an 11-year-old hound mix managing chronic kidney disease, and Bishop, a Siamese cat.

Rachel is Veta's lead editorial contributor. She does not diagnose or prescribe; she explains what your vet's records are telling you and what questions are fair to ask.

Sources

Merck Veterinary Manual. Emergency and Critical Care overview; Acute Gastroenteritis in Small Animals. merckvetmanual.com.
American Veterinary Medical Association. 2024 Pet Owner Emergency Preparedness policy and triage guidance. avma.org.
Cornell Feline Health Center. Vomiting in Cats; When to See a Veterinarian. vet.cornell.edu.
American College of Veterinary Internal Medicine. 2022 ACVIM Consensus Statement on the Classification, Diagnosis, and Management of Cardiomyopathies in Cats. JVIM 36(3).
Pet Poison Helpline and ASPCA Animal Poison Control Center. Household toxin resources and case-management protocols. petpoisonhelpline.com; aspca.org.
FDA Center for Veterinary Medicine. Adverse Event Reports for pet exposure to human NSAIDs. fda.gov/animal-veterinary.