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Pet Emergency Warning Signs: When to Call Your Burlington Vet

August 27, 2026

The phone rings just after we have flipped the sign on Brant Street. A voice on the other end is trying to stay calm, saying their dog was fine an hour ago and now he is pacing the kitchen and drooling on the floor.

We hear a version of this call most weeks here in Burlington. Sometimes it is a cat who keeps darting to the litter box. Sometimes it is a dog who found something in the backyard.

The hard part is rarely the symptom itself. It is the question underneath it: is this a wait-until-morning thing, or a grab-the-keys thing?

Some signs mean call us today, and some mean skip the wait and head straight for emergency care. According to the Merck Veterinary Manual, bloat in dogs is an acute, life-threatening emergency where the duration of signs is itself a risk factor, so trouble breathing, a swelling belly, collapse, seizures, or a cat straining to pee all count as go-now moments.

If this is happening right now: call us at (905) 336-4002 during clinic hours. For a suspected poisoning any time of day, call Pet Poison Helpline at (855) 764-7661. Overnight or when we are closed, use our after-hours care page and head to your nearest 24/7 emergency hospital.

How do I know if my pet’s symptoms are a real emergency or if I can wait until morning?

When you are not sure, that uncertainty is your answer, so call us. Some problems get worse by the hour, and the College of Veterinarians of Ontario expects your vet to tell you how to reach care outside regular hours. You should never be left guessing on your own.

A good rule is to watch for a fast change from your pet’s normal. A dog who was bouncing around the Aldershot trails this morning and is now flat and unwilling to move is telling you something.

We tend to treat a few things as reasons to move quickly rather than wait: real trouble breathing, gums that look pale, blue, or brick-red, repeated collapse, an active seizure, uncontrolled bleeding, or obvious severe pain. A cat who cannot pass urine and a dog with a hard, swelling belly belong on that list too.

When you call, we will ask what changed, when it started, and what you are seeing right now. Those few answers usually make the wait-or-go decision clear. Here is a quick reference of go-now signs and what the sources actually say.

Warning signWhat the source saysSource
Dog trying to vomit with nothing coming up, plus a swelling bellyEarly sign of bloat, an acute life-threatening emergencyMerck Veterinary Manual
Cat straining in the litter box, passing little or no urineUrethral obstruction is a true emergency; death may follow within 24 to 48 hoursCornell Feline Health Center
Heavy panting, drooling, unsteadiness, collapse in warm weatherSigns of heat stressAVMA
Ate something that might be toxicCall before making a pet vomit; sooner is saferCornell Riney Canine Health Center / Pet Poison Helpline

When should I take my dog to the emergency vet for vomiting?

One or two vomits from a bright, comfortable dog is often a call-us-in-the-morning situation. Repeated vomiting is different, and so is trying to vomit while bringing nothing up. The Merck Veterinary Manual lists that nonproductive retching, along with drooling and restlessness, as an early sign of bloat, a life-threatening emergency.

Vomiting on its own is common and has many causes, from a raided garbage bin to a bug going around. What raises our concern is the whole picture around it.

Call us sooner if the vomiting keeps coming, if there is blood, if your dog also seems painful or bloated, if the belly looks bigger than normal, or if a young puppy or an older dog is involved. Dogs lose fluid fast, and a puppy who cannot keep water down can slide downhill in a day.

At a visit, we generally start with an exam and a conversation about what your dog may have eaten, then decide whether bloodwork, imaging and diagnostics, or fluids make sense. The goal is to separate a simple upset stomach from something that needs to be caught early.

What are the signs of bloat (GDV) in dogs, and how fast does it become dangerous?

According to the Merck Veterinary Manual, early signs of bloat, also called gastric dilation and volvulus, include nonproductive retching, drooling, restlessness, and a distended belly, and affected dogs may become recumbent and depressed. It is acute and life-threatening, and because the duration of signs raises the risk of death, it needs correcting immediately.

Bloat is a plain word for a serious problem. In GDV, the stomach fills with gas and can twist on itself, which cuts off blood flow and turns critical in a short window.

The Merck Veterinary Manual notes that GDV mainly affects large and giant breeds, naming Great Danes, German Shepherd Dogs, Irish and Gordon Setters, Weimaraners, Saint Bernards, Standard Poodles, and Basset Hounds among those at risk. Plenty of families across Halton own dogs on that list.

If your big dog is pacing, drooling, and trying to be sick with nothing coming up, do not wait to see if it passes. This is a call-now, go-now situation, and fast critical care is what makes the difference.

My cat is straining in the litter box but not peeing, is that an emergency?

Treat it as one, especially with a male cat. Cornell’s Feline Health Center calls urethral obstruction a true medical emergency and notes the time from complete blockage to death may be less than 24 to 48 hours. The AVMA adds that male cats are at greater risk because their urethra is longer and narrower.

Feline lower urinary tract disease, or FLUTD, is a group of problems affecting a cat’s bladder and urethra. Cornell’s Feline Health Center lists the common signs as difficult or painful urination, going more often, crying out while urinating, blood in the urine, peeing outside the box, and frequent licking of the genital area.

A cat who is squatting again and again with little or nothing to show, or crying in the box, may be blocked and unable to pass urine at all. That is the version we never ask you to sleep on.

Cornell notes the cats most at risk tend to be middle-aged, overweight, less active indoor litter-box users who drink less water, with multi-cat-household stress adding to it. Keeping a healthy weight through nutrition and weight management is one piece owners can influence. If you see straining today, call us; if we are closed, go to an emergency hospital right away.

What are the warning signs of heatstroke in a dog?

A warm Burlington afternoon by the lake can turn a normal walk risky in a hurry. The AVMA lists anxiousness, heavy panting, restlessness, drooling, unsteadiness, abnormal gum and tongue colour, and collapse as signs of heat stress. If you see them, move your dog somewhere cool and call us or an emergency hospital.

Late summer is exactly when we worry about this. Pavement on Brant Street holds heat long after the sun drops, and a dog has far fewer ways to shed it than we do.

The AVMA is blunt about the biggest avoidable cause: never leave a pet in a parked car, even in the shade or with the windows cracked, because cars can overheat to deadly temperatures quickly. It also notes that overweight pets and short-nosed, or brachycephalic, breeds carry a higher risk in warm weather.

Walk early or late, bring water, and rest in the shade along the waterfront rather than pushing through the heat of the day. Heatstroke moves fast, so treat the signs above as a reason to act, not to wait and watch.

Should I make my pet vomit if I think they ate something poisonous?

Not on your own. Cornell’s Riney Canine Health Center warns that making a pet vomit is not always the right move and is sometimes contraindicated, so the safest step is to call first. Pet Poison Helpline notes the sooner an exposure is addressed, the easier, less expensive, and safer it is to treat.

Some substances do more damage coming back up than they did going down, which is why we do not want you guessing at home. A quick phone call settles it.

Call us during the day, or reach Pet Poison Helpline at (855) 764-7661, which is staffed around the clock (a per-incident consultation fee applies). Have a few details ready: what your pet got into, roughly how much, and when it happened.

Do not wait for symptoms to appear before you call. If you know or strongly suspect a poisoning, that is the moment to pick up the phone, and our after-hours care page points you to overnight help when we are closed.

Who do I call if my pet has an emergency after my regular vet is closed in Burlington?

During the day, call us on Brant Street first. After we close, Ontario rules require your vet to tell you how to reach care outside regular hours, so keep those instructions somewhere you can find them fast. For a life-threatening emergency overnight, go to the nearest 24/7 hospital.

The College of Veterinarians of Ontario sets this out in its After-Hours Care Services policy under Regulation 1093. A licensed Ontario vet must provide or arrange after-hours access for patients they treat, whether through on-call service, teletriage, a coverage agreement, or referral to an accredited emergency clinic.

For Burlington and the wider Halton area, Burlington Veterinary Emergency & Referral Hospital on Woodview Road is open 24 hours a day, every day. Owners over toward Oakville and west Halton also have a 24/7 option at the Mississauga-Oakville Veterinary Emergency Hospital.

Our own instructions live on our after-hours care page, so it is worth reading it once now, before you ever need it. The middle of an emergency is the wrong time to be searching for a phone number.

Frequently asked questions

What should I do if my dog ate chocolate, grapes, or xylitol?

Call right away rather than waiting for signs. These are among the more common poisoning calls we field, and Pet Poison Helpline notes the sooner an exposure is handled, the easier and safer it is to treat. Reach us at (905) 336-4002 during the day, or Pet Poison Helpline at (855) 764-7661, and have the amount and timing ready.

Are lilies really that dangerous to cats?

It is one of the most common questions cat owners ask us, and our answer is always the same: treat any lily exposure in a cat as urgent and call for help before you wait and watch. Phone us during the day, or reach a 24/7 poison line, so an expert can tell you the safest next step for your cat.

What number do I call for animal poison control in Ontario?

Two 24/7 lines serve Ontario owners: Pet Poison Helpline at (855) 764-7661 and the ASPCA Animal Poison Control Center at (888) 426-4435. Both are staffed by toxicology experts around the clock, and a per-incident consultation fee applies. You can also simply call us during clinic hours and we will help you decide.

Is a single episode of vomiting or diarrhea worth a visit?

Often a one-off with an otherwise bright, playful pet can be watched at home for a short while. Call us sooner if it repeats, if you see blood, if your pet is a puppy, kitten, or senior, or if there is pain, a swelling belly, or low energy. When in doubt, a quick phone call to our team on Brant Street sorts it out.

Which dogs are most at risk of bloat?

The Merck Veterinary Manual identifies large and giant breeds as most susceptible, naming Great Danes, German Shepherd Dogs, Irish and Gordon Setters, Weimaraners, Saint Bernards, Standard Poodles, and Basset Hounds, with genetics and older age adding to the risk. If you share your home with a deep-chested dog, it is worth learning the early signs before you ever need them.

How do I reach the clinic during the day versus after hours?

Reach our team on Brant Street at (905) 336-4002 during regular hours for anything from an urgent question to booking a same-day look. Outside our hours, our after-hours care page explains how to get help, and Ontario rules require your vet to point you toward care when the clinic is closed. Save both the number and the page now.

This article is educational and isn’t veterinary advice or a substitute for an exam. If you’re worried about your pet right now, call us at (905) 336-4002 or your nearest emergency veterinary hospital.

If something feels off with your dog or cat and you are not sure how urgent it is, you do not have to sort it out alone. Our team on Brant Street is glad to talk it through and help you decide on the next step.

Request an appointment

Sources

Bloat (GDV) in dogs

  1. Merck Veterinary Manual. Gastric Dilation and Volvulus in Small Animals. https://www.merckvetmanual.com/digestive-system/surgical-problems-of-the-gastrointestinal-tract-in-small-animals/gastric-dilation-and-volvulus-in-small-animals

Feline urinary emergencies

  1. Cornell Feline Health Center. Feline Lower Urinary Tract Disease. https://www.vet.cornell.edu/departments-centers-and-institutes/cornell-feline-health-center/health-information/feline-health-topics/feline-lower-urinary-tract-disease
  2. American Veterinary Medical Association. Feline Lower Urinary Tract Disease. https://www.avma.org/resources-tools/pet-owners/petcare/feline-lower-urinary-tract-disease

Heat safety

  1. American Veterinary Medical Association. Warm Weather Pet Safety. https://www.avma.org/resources-tools/pet-owners/petcare/warm-weather-pet-safety

Poisoning and poison control

  1. Cornell Riney Canine Health Center. First Aid for Poisonous Substances. https://www.vet.cornell.edu/departments-centers-and-institutes/riney-canine-health-center/canine-health-topics/first-aid-poisonous-substances
  2. Pet Poison Helpline. https://www.petpoisonhelpline.com/
  3. ASPCA Animal Poison Control Center. https://www.aspca.org/pet-care/aspca-poison-control

After-hours care in Ontario

  1. College of Veterinarians of Ontario. After-Hours Care Services (Regulation 1093). https://www.cvo.org/standards/after-hours-care-services
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