Echocardiography for Dogs, Cats, and Other Pets
TL;DR: Quick Summary
Echocardiography, often called an echo or cardiac ultrasound, is a safe, non-invasive imaging test that allows veterinarians to see the heart working in real time.
It helps evaluate:
- Heart size
- Heart shape
- Heart chamber size
- Heart wall thickness
- Heart valve movement
- Blood flow through the heart
- Pumping strength
- Fluid around the heart
- Certain birth defects
- Some heart tumors or heartworm complications
Veterinarians often recommend an echocardiogram when a pet has a heart murmur, coughing, trouble breathing, fainting, weakness, exercise intolerance, abnormal X-rays, or a breed-related risk of heart disease.
At Southern Ocean Animal Hospital, Dr. Dan and the team use echocardiography as part of a complete diagnostic plan to better understand your pet’s heart health and guide treatment decisions with care and confidence.
ELI5: Echocardiography Explained Simply
Think of an echocardiogram like a live video of your pet’s heart.
Instead of taking a still picture, it lets the veterinarian watch the heart as it beats.
Dr. Dan can see:
- Are the heart valves opening and closing correctly?
- Is blood flowing the right way?
- Is the heart muscle too thick?
- Is the heart too stretched out?
- Is the heart pumping strongly enough?
- Is there fluid around the heart?
It is like looking under the hood of a car while the engine is running.
The test does not hurt. It uses sound waves, not radiation.
Introduction
Your pet’s heart works every moment of every day. It pumps blood, delivers oxygen, supports energy, and keeps the rest of the body functioning. When the heart is healthy, most pet owners never think about it. But when a veterinarian hears a murmur, notices an abnormal rhythm, sees coughing or breathing changes, or suspects heart disease, a deeper look may be needed.
That is where echocardiography becomes one of the most valuable tools in veterinary medicine.
Echocardiography is an ultrasound examination of the heart. It uses sound waves to create real-time images of the heart’s structure and movement. Unlike a regular X-ray, which shows the size and outline of the heart, an echocardiogram shows the heart in motion.
This allows veterinarians to evaluate how the heart is actually working.
At Southern Ocean Animal Hospital, echocardiography may be recommended for dogs, cats, and other pets when there are signs of heart disease, breed-related concerns, or unexplained symptoms that may involve the heart.
An echocardiogram can help Dr. Dan answer important questions, such as:
- Is this heart murmur serious?
- Are the valves leaking?
- Is the heart muscle too thick or too weak?
- Is the heart enlarged?
- Is blood flowing normally?
- Does my pet need medication?
- Is anesthesia safe for my pet?
- Should we monitor this condition over time?
For pet owners, those answers can bring relief, direction, and peace of mind.
Key Ideas for Pet Owners
- Echocardiography is a specialized ultrasound of the heart.
- It is safe, painless, and non-invasive.
- It uses sound waves, not radiation.
- It allows veterinarians to see the heart beating in real time.
- It is often used to evaluate heart murmurs, coughing, breathing problems, fainting, and weakness.
- It helps diagnose valve disease, cardiomyopathy, birth defects, fluid around the heart, and some tumors.
- It is especially important in cats because heart disease may be hidden until it becomes serious.
- It helps guide medication choices and long-term monitoring.
- Some pets may need repeat echocardiograms to track progression over time.
What Is Echocardiography?
Echocardiography is a diagnostic imaging test that uses ultrasound to examine the heart.
A handheld tool called a transducer is placed against the chest. A small amount of gel helps the sound waves travel through the skin. The ultrasound machine then creates moving images of the heart on a screen.
During the exam, the veterinarian can evaluate:
- The heart chambers
- The heart walls
- The valves
- The major blood vessels
- The direction of blood flow
- The speed of blood flow
- The strength of heart contractions
- Whether fluid is present around the heart
An echocardiogram is different from simply listening to the heart with a stethoscope. A stethoscope can detect sounds like murmurs or irregular rhythms, but it cannot show why those sounds are happening.
An echo helps reveal the cause.
Echocardiography vs. Regular Ultrasound
Echocardiography is a type of ultrasound that focuses specifically on the heart.
| Test | What It Looks At | Common Uses |
|---|---|---|
| Abdominal Ultrasound | Liver, spleen, kidneys, bladder, intestines | Vomiting, weight loss, urinary issues, masses |
| Echocardiography | Heart and major blood vessels | Murmurs, valve disease, cardiomyopathy, heart failure |
| Digital X-rays | Chest, bones, abdomen, lungs | Heart size, lung changes, fractures, foreign objects |
| ECG/EKG | Electrical rhythm of the heart | Arrhythmias, irregular heartbeat |
These tests often work together. For example, a dog with a cough may need chest X-rays to check the lungs and an echocardiogram to evaluate the heart valves.
Why Would My Pet Need an Echocardiogram?
An echocardiogram may be recommended when the heart needs a closer look.
Common reasons include:
- Heart murmur
- Coughing
- Labored breathing
- Fainting or collapse
- Weakness
- Exercise intolerance
- Enlarged heart on X-rays
- Abnormal heart rhythm
- Fluid in the chest or abdomen
- Breed-related heart disease risk
- Pre-anesthetic heart evaluation
- Suspected congenital heart defect
- Monitoring a known heart condition
Sometimes pets act completely normal but still have a murmur or hidden heart disease. Echocardiography helps determine whether treatment is needed now or whether monitoring is the best approach.
What Is a Heart Murmur?
A heart murmur is an abnormal sound heard when a veterinarian listens to the heart with a stethoscope.
A murmur does not always mean a pet is in immediate danger. Some murmurs are mild. Some are related to age. Some are caused by heart disease that needs treatment.
An echocardiogram helps determine:
- Where the murmur is coming from
- Whether a valve is leaking
- Whether the heart is enlarged
- Whether medication is needed
- How often the heart should be monitored
This is especially important because the loudness of a murmur does not always perfectly match the seriousness of the disease.
What Can Echocardiography Diagnose?
Echocardiography can help diagnose many different heart conditions.
Valve Disease
Heart valves act like doors that control blood flow. If a valve becomes thickened, weak, or leaky, blood may flow backward.
This is common in older small-breed dogs, especially with the mitral valve.
Dilated Cardiomyopathy
Dilated cardiomyopathy, often called DCM, is a disease where the heart becomes enlarged and weak. The heart chambers stretch, and the heart muscle loses pumping strength.
This is more common in large and giant dog breeds.
Hypertrophic Cardiomyopathy
Hypertrophic cardiomyopathy, often called HCM, is most commonly discussed in cats. It causes the heart muscle to become abnormally thick, which can make it harder for the heart to fill and pump properly.
Congenital Heart Defects
Some pets are born with heart defects. These may include:
- Patent ductus arteriosus
- Subaortic stenosis
- Pulmonic stenosis
- Ventricular septal defect
An echocardiogram can help identify the defect and guide treatment recommendations.
Pericardial Effusion
Pericardial effusion means fluid has built up in the sac around the heart. This can become life-threatening because the fluid can prevent the heart from filling and pumping normally.
Heart Tumors
Some heart tumors may be seen or suspected during echocardiography, especially if fluid is present around the heart.
Pulmonary Hypertension
Pulmonary hypertension means high blood pressure in the vessels of the lungs. Echocardiography can help assess signs that suggest this condition.
Heartworm Complications
In severe cases, echocardiography may help identify adult heartworms in the heart or major blood vessels.
Signs of Heart Disease in Pets
Heart disease can be obvious, subtle, or completely hidden in early stages.
Possible Signs in Dogs
- Coughing
- Trouble breathing
- Tiring quickly
- Fainting
- Weakness
- Restlessness at night
- Swollen belly
- Weight loss
- Decreased appetite
- Collapse
Possible Signs in Cats
- Fast breathing
- Open-mouth breathing
- Hiding
- Weakness
- Decreased appetite
- Sudden rear-leg weakness or paralysis
- Collapse
- Sudden severe distress
Cats do not usually cough from heart disease as often as dogs do. In cats, breathing changes are often the biggest warning sign.
Emergency Warning Signs
Some symptoms should never wait.
Call a veterinarian or emergency hospital immediately if your pet has:
- Open-mouth breathing
- Blue or gray gums
- Collapse