Belly Tight at 1 A.M.? St. Louis Emergency Vets Open 24/7
Revised October 20, 2026
What is considered an emergency for a vet in St. Louis?
Anything that threatens your pet’s life or gets worse by the hour: trouble breathing, a swollen belly with dry heaving, a cat straining in the litter box with little or no urine, poisoning, seizures, being hit by a car, or collapse. Around St. Louis, VEG in Brentwood, Animal Emergency Clinic in Kirkwood and Veterinary Specialty Services in Manchester all list 24/7 emergency care. Call on the way.
Keep reading ↓Belly tight as a drum, 1 a.m., and your big dog is heaving over and over and bringing up nothing. He paces the kitchen, drool strung off his lip onto the tile. You’re in socks with the car keys already in your fist, wondering if this is an overreaction you’ll be paying off for months. Waiting until morning feels like the cheap, sensible choice. It isn’t. The American College of Veterinary Surgeons calls this, gastric dilatation-volvulus, a rapidly progressive life-threatening condition of dogs that requires immediate medical attention, and it lists clinical signs for more than 6 hours among the factors that raise the death rate.
Here is the St. Louis part almost nobody knows. If that twisted stomach has damaged the blood vessels around the spleen, the surgeons’ college notes that a blood transfusion may be indicated. VEG’s hospital at 250 Mid Rivers Mall Circle in St. Peters is a VEG Blood Bank location, which provides blood for canines, and its page says those donations help save the lives of dogs in need of transfusions. So the healthy dog snoring on somebody’s couch tonight, paws twitching through a dream about squirrels, could be the reason yours comes home.
What is considered an emergency for a vet in St. Louis?
Anything that threatens your pet’s life or gets worse by the hour: trouble breathing, a swollen belly with dry heaving, a cat straining in the litter box with little or no urine, poisoning, seizures, being hit by a car, or collapse. Around St. Louis, VEG in Brentwood, Animal Emergency Clinic in Kirkwood and Veterinary Specialty Services in Manchester all list 24/7 emergency care. Call on the way.
Which St. Louis emergency vets are open 24/7?
If you’re in the car right now, these are the numbers. VEG ER for Pets sits at 2101 South Brentwood Boulevard, just south of Brentwood Square, (314) 970-2545. Its St. Peters hospital, the one with the blood bank, answers at (636) 206-4789. VEG says you can call and speak to a doctor, that staff will meet you at your car if you need help bringing your pet in, and that you stay with your pet the entire time, even if surgery is involved. No plastic lobby chair. No swinging door you’re not allowed through.
Animal Emergency Clinic says it provides 24/7 emergency care at both of its locations: 9937 Big Bend Road in Kirkwood, 314-822-7600, and 334 Fort Zumwalt Square in O’Fallon, 636-240-5496. Veterinary Specialty Services lists emergency care 24 hours on weekdays, weekends and holidays at 1021 Howard George Drive in Manchester, emergency line (636) 227-6100, and at VSS West, 7770 Winghaven Boulevard in O’Fallon, emergency line (636) 244-8999 (its referral line is (636) 244-9004). On the Illinois side, Animal Emergency Center sits at 2005 Mall St. in Collinsville, (618) 346-1843; call to check its hours before you cross the river. Hours and phone lines can change, so call while someone else drives.
Why is waiting until morning the expensive choice?
Because the bill follows how sick your pet is when you walk in, not what time it is. Pet Poison Helpline says it flat out on its own site: the sooner an exposure or poisoning is addressed, the easier, less expensive, and safer it is to treat. The ER exam is not the scary number. CareCredit’s state-by-state table puts the average emergency exam in Missouri at $115 for a dog and $122 for a cat. The same page lists one night of hospitalization at a vet clinic at $619 for a dog. The exam is the cover charge. The overnight stay, the IV line, the monitors beeping in a back room while you drive home alone - that is what waiting tends to buy.
Cats make the same point more quietly. He walks in and out of the litter box, squats, strains, and leaves almost nothing behind. You hear the litter scratch, then silence, then the scratch again. It looks like constipation. Cornell’s Feline Health Center says a urethral obstruction is an absolute emergency, requiring immediate veterinary treatment. A cat crouched in the box at 11 p.m. is not a morning problem.
Understanding When to Seek Emergency Veterinary Care
What happens when you walk in the door?
The light is bright, the floor smells of disinfectant, and someone takes your pet’s breathing and gums before they take your name. VEG puts it this way: emergency vet care starts the moment you walk in the door. Emergency hospitals see the sickest patient first, not the first one through the door, so a dog in respiratory distress goes ahead of a limping cat that came in earlier. That wait can feel unfair from the chair. It’s the same rule that will put your pet first on the worst night.
Before any treatment beyond stabilizing, ask for a written estimate. If it is more than you can cover, say so out loud, right there at the counter. Ask what has to happen tonight to keep your pet stable, whether a less intensive plan is possible, and whether the hospital takes a financing card such as CareCredit. Our guide to low-cost vet care in St. Louis covers clinics and programs that can help with the follow-up visits.
Not tonight’s problem, but worth a bookmark: our map of St. Louis pet services.
How much does an emergency vet visit cost in St. Louis?
The exam is the part you can predict. CareCredit puts the national average emergency exam at $135 for a dog and $143 for a cat, and Missouri runs a little under that. Cross the river and the Illinois averages are $122 for a dog and $130 for a cat. After the exam, diagnostic tests, medications, treatments, hospitalization or surgery can all raise the total, which is why one family drives home with a small bill and another sits in the parking lot staring at a long estimate. And the cheapest emergency plan of all is the one you set up early. One emergency bill is the real test of whether pet insurance is worth it, so run those numbers on a quiet weekend.
Is it urgent care or the ER?
Some problems are miserable but not life-threatening: an ear your dog won’t stop shaking, a small cut, a day of loose stool. For those, UrgentVet runs an after-hours clinic at 2524 Lemay Ferry Road, 314-354-5500, open 3PM-11PM Monday through Friday and 10AM-8PM on weekends. It says its care costs up to 40% less than the emergency vet and that it fills the gap between primary care and an emergency vet. Trouble breathing, a swollen belly or a blocked cat still belongs at a 24/7 ER.
For an older pet with a known illness, a planned house call from one of the mobile vets in St. Louis can handle comfort care at home and save the ER for true emergencies.
If your pet ate something it shouldn’t have
Grab the package, the pill bottle or the chewed leaf, and call a poison line while you get your shoes on. ASPCA Animal Poison Control answers 24 hours a day, 365 days a year, at (888) 426-4435, and says a consultation fee may apply. Pet Poison Helpline is at 855-764-7661 and lists a $99 per incident fee. Don’t make your pet vomit unless an expert tells you to.
What should you set up tonight?
Five minutes now saves you fumbling with shaking hands later.
Save two ER numbers: your closest 24/7 hospital from the list above and a backup, filed under something like “Vet ER” so you can find them without thinking.
Save a poison line: ASPCA (888) 426-4435 or Pet Poison Helpline (855) 764-7661.
Plan the lift: a sturdy carrier for cats and small dogs, a firm blanket that can work as a stretcher for a big dog.
Keep records on your phone: vaccines, medications and any ongoing conditions.
Know your exotics: if you keep a bird or a reptile, VEG says its team treats birds and exotics as well as dogs and cats.
Watch the brush piles: the Missouri Department of Conservation calls the eastern copperhead the most common venomous snake in Missouri. A bite on a dog that noses through woodpiles means a trip to the ER, even if your dog seems fine.
Knowing Your Local Emergency Veterinarian Service
Choosing your ER before you need one
Hospitals differ in ways you only notice at 2 a.m. At VEG you stay at your pet’s side. At many other ERs your pet goes back to the treatment area and the staff comes out with updates. VSS also runs specialty referral care by appointment, which matters if your pet may need a surgeon once it is stable. Whichever you pick, ask the ER to send its records to your regular vet, so the follow-up visit doesn’t start from zero. Tape a card with your regular vet’s name and phone number inside the lid of the carrier, too, so the ER can reach them even when your hands are shaking and your phone battery is down to a red sliver.
The best emergency plan starts with a regular vet who already knows your pet’s name and weight. If you don’t have one yet, our guide on how to choose a vet in St. Louis covers what to ask about after-hours coverage before you sign on.
For the good days after the bad one:
Put two ER numbers in your phone before you close this page. Then bookmark the St Louis Near Me pet services directory for the vets, groomers and sitters you’ll want on the calm days.
If you’re the clinic, the groomer or the one-person pet-sitting crew these owners call next, see who AI names instead of you, or get more customers from the St. Louis pet owners already looking.
Frequently Asked Questions
What are signs my pet needs immediate care?
Check the gums and the breathing first. Pale, gray or blue gums, fast or noisy breathing at rest, a hard swollen belly with dry heaving, a cat straining in the litter box with little or no urine, a seizure, or a pet that can’t stand all mean go now, not in the morning.
What are three signs your dog is suffering?
Watch breathing, behavior and body. Panting while resting; hiding, restlessness or snapping when touched; and a hunched posture, limping or refusing food are classic signs of pain. Any one that is new and lasting deserves a same-day call to your vet, and alongside other red flags, a trip to the ER.
How long should a dog be sick before going to the vet?
Not long. A bright, playful adult dog that vomits once may only need watching, but call your vet the same day if the vomiting or diarrhea keeps coming back, shows blood, or your dog stops drinking, and call sooner for a puppy or a senior. Weakness or a swollen belly means go now.
How much does an emergency vet visit cost?
In Missouri the emergency exam alone averages $115 for a dog and $122 for a cat, according to CareCredit’s published cost table. Tests, treatment and hospitalization come on top, and the same table lists a night in a vet clinic at $619 for a dog. Ask for a written estimate before treatment starts.
How much does urgent vet cost?
Usually less than an ER. UrgentVet, which runs an after-hours clinic on Lemay Ferry Road, says its care costs up to 40% less than the emergency vet. Urgent care fits ear infections, small cuts or a day of diarrhea; anything life-threatening still belongs at a 24/7 ER. Call for current fees.
What to do when you can’t afford an emergency vet?
Tell the front desk your budget before treatment starts. Ask what has to happen tonight to stabilize your pet, whether a less intensive plan is possible, and whether they accept financing such as CareCredit. Then line up follow-up care through the low-cost clinics and assistance programs around St. Louis.
Is there a 24-hour emergency vet in St. Louis?
Yes, six list it on their own sites: VEG ER for Pets in Brentwood and St. Peters, Animal Emergency Clinic in Kirkwood and O’Fallon, and Veterinary Specialty Services in Manchester and O’Fallon. The St Louis Near Me Directory pet services map shows other clinics near you for the days that aren’t emergencies.
Written by a dedicated team of St. Louis locals who live, work, and play right here in the St. Louis metro. Founder Lane Forman and team are committed to building the region’s most trusted directory by verifying listings and connecting local businesses with loyal customers across Missouri and Illinois.