What is peritoneopericardial diaphragmatic hernia?

Peritoneopericardial diaphragmatic hernia occurs when abdominal organs shift near or into the pericardial sac. Common signs include vomiting, abdominal distension, or changes in breathing. X-ray or ultrasound is needed to confirm the condition, and treatment options are determined by your vet.

Does every case require surgery?

Whether surgery is needed depends on the degree of organ displacement and clinical symptoms. Cases with minimal displacement and no functional impairment may be monitored; surgery is often recommended when breathing is affected or vomiting is persistent. Follow your vet's assessment.

What care is needed after surgery?

After surgery, restrict activity and attend follow-up imaging appointments on schedule. Monitor for vomiting, changes in breathing, and appetite, and follow the vet's dietary and care instructions to support recovery.

How much does diagnosis and treatment typically cost?

Costs vary by clinic and region — ask your vet for an estimate before proceeding.

What are the typical costs for testing and treating this condition?

Main costs typically include X-ray, cardiac ultrasound, and CT. As a congenital defect, many cases do not require treatment.

Disease Guide

Peritoneopericardial Diaphragmatic Hernia in Dogs & Cats: Vomiting, Breathing Changes, Imaging & Care [2025]

Congenital diaphragmatic defect allowing abdominal organs to enter the pericardial sac

Take 1 minute to check the symptoms first

Last updated: 2026/01/06

Pethealthmap Editorial Team

Sources: ACVIM, National Taiwan University Veterinary Medicine

When to See a Vet

Seek immediate veterinary care (emergency)

•Persistent inability to breathe normally or panting until collapse
•Repeated large-volume vomiting with inability to eat or drink
•Lethargy that makes the pet difficult to wake or altered consciousness

Schedule a veterinary appointment soon (within 24-72 hours)

•Intermittent or repeated mild vomiting
•Breathing faster than usual, but still able to rest and sleep independently
•Persistent decreased appetite or short-term weight loss

01What symptoms indicate something is wrong?

Peritoneopericardial diaphragmatic hernia commonly presents with digestive and respiratory symptoms; severity varies widely and imaging is needed to confirm whether organs have shifted out of place.

Repeated vomiting or frequent vomiting after meals
Persistent changes in bowel habits or stool consistency
Gradual weight loss or noticeably reduced appetite
Frequent coughing or increasingly rapid or laboured breathing
Visible discomfort or flinching when the abdomen or chest is touched

Seek emergency care immediately if you notice the following symptoms:

⚠️ Breathing difficulty or a marked worsening of respiratory distress
⚠️ Unable to eat or continuous profuse vomiting
⚠️ Extreme lethargy, difficulty rousing, or altered consciousness

02How do you assess an abnormality at home? Key observations and emergency criteria

Keeping a systematic record of symptoms at home speeds up the vet's assessment — the information is especially valuable before imaging.

Record the number of vomiting episodes, the timing, and a description of what was vomited
Note bowel movement frequency, stool consistency, and how many days diarrhoea has lasted
Weigh your pet weekly and log any weight changes and when they occurred
Film short videos of coughing or rapid breathing to show the vet
Observe and note changes in alertness, food intake, and water consumption with timestamps

03How will the vet make a diagnosis? Common diagnostic tests

At the clinic, physical examination and imaging are the primary steps; cardiac and blood tests are added as needed to understand the extent of organ involvement.

Physical examination

palpation of the abdomen and auscultation of the heart and lungs, noting any pain responses

X-ray

assess whether abdominal and thoracic organs have shifted position

Cardiac ultrasound

check whether the pericardial sac and cardiac structures are affected

ECG

evaluate heart rhythm and possible electrophysiological abnormalities

CT

used in complex cases for precise localisation and surgical planning

Blood tests

assess for infection, dehydration, and anaesthetic risk

04How is it treated and managed after diagnosis? Medications, diet adjustments & care guide

Treatment depends on the pet's condition; regular imaging and clinical monitoring are required after surgery or conservative management, with care adjustments made according to vet instructions.

Choose between conservative monitoring or surgery based on the pet's condition, with risks explained
Adjust diet and provide targeted nutritional support or feeding methods as directed by the vet
Continue recording vomiting, bowel movements, and breathing changes at home for follow-up visits
Attend regular check-ups to monitor imaging and functional outcomes and track recovery progress
If symptoms worsen or recur, arrange a specialist follow-up assessment promptly

05What to prepare before seeing the vet? Key information to help the vet quickly identify the cause

Note when symptoms started, how often they occur, and any changes over time

Bring photos or samples of vomit or stool (when safe to collect)

List all current medications, supplements, and known allergies

Bring previous X-ray or ultrasound reports if available

Prepare videos and note the time recorded, the circumstances, and any triggering factors

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.