What early signs can an atrial wall tear cause?

Early signs may include coughing, faster breathing, reduced activity, or a lower appetite. If you notice these signs, record them and consult your veterinarian.

What tests will the veterinarian perform at the clinic?

Common tests include a physical examination, chest X-rays, echocardiography, and blood biochemistry. An electrocardiogram or CT scan may be arranged if needed.

If my pet briefly faints, do they need to see a vet immediately?

If your pet briefly faints or remains weak after recovering, seek veterinary assessment promptly to rule out serious heart or lung problems.

How long is follow-up needed after treatment?

The follow-up schedule depends on the condition. During the acute stage, frequent monitoring may be needed. After discharge, several imaging and function checks are often arranged based on your veterinarian's advice.

How much do the tests and treatment usually cost?

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

Disease Guide

Atrial Wall Tear in Dogs and Cats: Breathing Signs, Imaging & Home Care [2025]

An atrial wall tear is an emergency condition, often seen in young dogs with heart valve disease, causing blood to collect around the heart and requiring urgent care.

Take 1 minute to check the symptoms first

Last updated: 2026/01/05

Pethealthmap editorial team

Sources: ACVIM, National Taiwan University Veterinary Hospital

When to See a Vet

Immediate veterinary care required (emergency)

•Persistently unable to breathe calmly or breathing with an open mouth
•Sudden loss of consciousness or prolonged collapse
•Gums or tongue appear purple or pale

Schedule a clinic visit as soon as possible (within 24-72 hours)

•Coughing after exercise or breathing remains rapid
•Noticeably decreased activity, reluctance to play or walk
•Brief fainting episodes or weakness after recovery

01What symptoms suggest something is wrong?

An atrial wall tear often causes heart, lung, and whole-body signs. Owners may notice changes in breathing, activity level, and appetite.

Reduced energy and a clear drop in activity, with reluctance to run, jump, or play
Repeated or severe coughing, especially after exercise or at night
Rapid breathing, panting, or open-mouth breathing, even when resting
Fast or irregular heartbeat, noticeable palpitations, or breathing that seems poorly coordinated
Brief loss of consciousness or collapse, with ongoing tiredness after recovery
A swollen abdomen or a marked drop in appetite, with changes in toileting habits

Seek emergency care immediately if you notice the following symptoms:

⚠️ Difficulty breathing or open-mouth breathing, especially if your pet cannot breathe calmly
⚠️ Sudden loss of consciousness or ongoing collapse with no response
⚠️ Purple, blue, or pale gums, which need immediate veterinary attention

02How can you assess changes at home? Key observations and emergency warning signs

At home, you can record key observations that help your veterinarian assess the condition and plan appropriate tests more quickly.

Record how often coughing happens, how long each episode lasts, and what seems to trigger it
Count the number of breaths per minute over several minutes while your pet is calm
Watch for changes in alertness, willingness to interact, and tolerance for activity
Note the timing and changes in appetite, food intake, and water intake
Check whether the abdomen looks swollen and whether urination or bowel movements are abnormal
Use your phone to record breathing or coughing when an episode occurs

03How will the veterinarian diagnose it? Common tests

At the clinic, your veterinarian will combine a physical examination with imaging and blood tests to assess the condition and decide on the next steps.

Physical examination

heart and lung auscultation, palpation, and assessment of vital signs

Chest X-rays

to assess heart size and check for fluid or changes in the lungs

Echocardiography

to evaluate the atria, ventricles, and the heart's structure and function

CT scan

used when more detailed imaging of the heart and chest is needed

Blood tests and biochemistry

to assess overall metabolism, infection, and organ function

Electrocardiogram

arranged if an abnormal heart rhythm is suspected

04How is it treated and managed after diagnosis? Medication, diet adjustments, and care guidance

Treatment and monitoring depend on the severity of the condition. The acute stage may require hospital care, and follow-up visits plus home monitoring are important after discharge.

During the acute stage, oxygen therapy, fluids, and hospital monitoring may be needed
Your veterinarian may use medication or interventional procedures to control signs and arrange follow-up care
After discharge, regular rechecks are needed to monitor imaging findings and heart function
Follow veterinary instructions on diet, salt intake, and activity restriction if recommended
At home, record daily changes in breathing, activity level, and appetite to report to your vet
If signs worsen, contact the clinic promptly or arrange a specialist recheck

05What should you prepare before seeing the vet? Key details that help clarify the cause

Record when the signs started, how often they occur, and whether they are getting worse

Prepare notes on recent changes in food intake, water intake, urination, and bowel movements

Bring a list of any current medications or supplements for reference

Record short phone videos of coughing or breathing episodes and keep a backup

Bring previous X-rays, ultrasound images, or laboratory reports if available

Use a secure carrier and lead to reduce stress during travel

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.