Pyloric Hypertrophy in Dogs & Cats: Symptoms, Endoscopy & Treatment [2025]
Chronic hypertrophic pyloric gastropathy is a condition in which thickening of the pyloric muscle obstructs gastric outflow. It is most common in brachycephalic dogs and Siamese cats. The hallmark sign is postprandial vomiting; severe cases may require surgical widening of the pylorus.
When to See a Vet
Seek immediate veterinary care (emergency)
- •Repeated vomiting for more than 24 hours and unable to eat
- •Vomit or stool appears bright red or black
- •Depressed, weak, and clearly dehydrated
Schedule a clinic visit as soon as possible (within 24-72 hours)
- •Vomiting or retching multiple times a day
- •Appetite is clearly decreased or food is refused for more than 48 hours
- •Frequent retching, drooling, or choking/coughing after eating
01What symptoms signal a problem?
Chronic hypertrophic pyloric gastropathy commonly causes intermittent or persistent vomiting, difficulty eating, and weight loss — symptoms that may recur over weeks to months.
- Repeated vomiting, often bringing up undigested food or small amounts
- Reduced appetite, selective eating, or complete refusal to eat
- Progressive weight loss and visible thinning
- Regurgitation or food reflux shortly after eating
- Drooling during meals, occasional coughing, or difficulty swallowing
- Decreased energy and activity; less interest in play or exercise
Seek emergency care immediately if you notice the following symptoms:
- ⚠️ Continuous vomiting for more than 24 hours with inability to keep food down
- ⚠️ Vomit or stool that is bright red or black in color
- ⚠️ Lethargy, weakness, and obvious signs of dehydration
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02How to assess an abnormality at home? Key observations and emergency criteria
Keeping a record of key observations at home helps your vet quickly assess the progression of the condition and plan appropriate diagnostics.
- Note the date when symptoms first appeared and how they developed
- Record the number of vomiting episodes each day, along with the time and contents
- Photograph vomit and stool for your vet's reference
- Weigh your pet at the same time each week and track any changes
- Note any recent changes to food, treats, or feeding routine
- Observe whether energy levels, water intake, and bowel movements have changed
- Bring all records to your vet appointment for review
03How will the vet diagnose this? Common diagnostic tests
At the clinic, the vet will assess your pet's overall condition using blood work, imaging, and endoscopy to identify the cause and degree of obstruction.
Full physical examination and abdominal palpation to assess pain or masses
Blood and biochemistry panel to evaluate dehydration and metabolic abnormalities
Urinalysis to rule out concurrent conditions or evidence of dehydration
Abdominal ultrasound to evaluate pyloric and gastric structure and motility
Abdominal X-ray or CT scan to assess obstruction, masses, or foreign bodies
Gastroscopy allows direct visualization of the pylorus with the option to biopsy or remove foreign material
A clinic equipped with endoscopy and advanced imaging is recommended
04What treatment and aftercare are needed? Medications, diet adjustments, and care guide
Treatment depends on the underlying cause and severity, and may include medication, dietary modification, or surgery — with regular follow-up monitoring of symptoms and test results.
- Antiemetics and gastric protectants to control symptoms
- A low-fat, easily digestible prescription diet
- Surgery may be required for significant pyloric obstruction or complications
- Regular recheck appointments during treatment to monitor weight and bloodwork
- Gradual reintroduction of feeding and activity as directed by your vet post-surgery or during treatment
- Feed small, frequent meals at home and monitor for vomiting and changes in energy
- If symptoms recur, arrange a specialist referral or follow-up imaging
05What should you prepare before the vet visit? Key information to help your vet quickly identify the cause
This content is for reference only and cannot replace a professional veterinary diagnosis. If your pet shows signs of illness, please seek veterinary care promptly.