Heart Disease in Dogs: A Complete Guide for Caring Owners

Heart disease affects roughly 1 in 10 dogs and is one of the most common causes of death in older pets. Understanding the signs, types, and treatments can help you catch problems early — when management is most effective.

Heart disease in dogs is more common than most owners realize. According to veterinary cardiology research, approximately 10% of dogs seen in primary care practices have some form of heart disease — and that number rises dramatically with age, affecting up to 75% of senior dogs in certain breeds. The good news: early detection and modern treatment can add months or even years of comfortable life.

Unlike a sudden injury, heart disease develops silently. By the time obvious symptoms appear — coughing, fainting, difficulty breathing — the condition is often advanced. That is why understanding the subtle early signs and attending routine wellness exams matters so much. Your veterinarian listening for a heart murmur during an annual checkup can be the first step toward years of successful management.

This guide breaks down everything a caring dog owner needs to know: the types of heart disease, the symptoms to watch for, how diagnosis works, what treatment involves, and how you can support your dog's heart health through nutrition and lifestyle. If you are researching because your dog has been diagnosed, or because you want to be proactive, you are in the right place.

Understanding Heart Disease in Dogs

A dog's heart works much like a human heart: four chambers, valves that keep blood flowing in one direction, and a rhythmic electrical system that coordinates each beat. Heart disease occurs when any part of this system fails — valves leak, muscles weaken, or the electrical rhythm becomes irregular.

The result is that the heart cannot pump blood efficiently. Blood backs up into the lungs or body, causing fluid accumulation (congestion) and depriving organs of oxygen. This is why the condition is called congestive heart failure once fluid buildup occurs — it is a syndrome, not a single disease.

Key distinction: "Heart disease" describes the underlying condition (like a leaky valve or weak muscle). "Heart failure" describes the clinical syndrome that develops when the heart can no longer compensate. A dog can have heart disease for years before heart failure develops.

Many dogs live long, comfortable lives with heart disease that is diagnosed early and managed well. The condition is rarely curable, but it is often highly manageable — which is why proactive monitoring is so valuable. If your dog is a breed predisposed to cardiac issues, understanding the genetics behind conditions like hip dysplasia and other hereditary problems can also inform your overall health monitoring strategy.

Types of Heart Disease in Dogs

Veterinarians classify canine heart disease into two broad categories: acquired (develops during life, usually in middle-aged or senior dogs) and congenital (present from birth, often detected in puppies). Within those categories are several specific conditions, each with its own breed predilections and treatment approach.

Acquired Heart Diseases

Mitral Valve Disease (MVD)

The most common heart disease in dogs overall. The mitral valve — between the left atrium and left ventricle — thickens and leaks, allowing blood to flow backward. The heart works harder to compensate, eventually enlarging and failing. Most common in small breeds.

Most common in small breeds

Dilated Cardiomyopathy (DCM)

The heart muscle becomes thin, weak, and stretched, so the chambers dilate and cannot contract forcefully. This reduces pumping efficiency and often leads to arrhythmias. Most common in large and giant breeds. Sometimes linked to diet (grain-free, legume-heavy formulas).

Most common in large breeds

Myxomatous Mitral Valve Disease (MMVD)

A specific degenerative form of MVD where the valve leaflets become thickened and nodular. This is the technical term for the most common acquired heart disease in dogs. Cavalier King Charles Spaniels are especially predisposed and often develop it at a young age.

Degenerative valve condition

Arrhythmias

Abnormal heart rhythms caused by problems with the heart's electrical system. Can be benign or life-threatening. Atrial fibrillation and ventricular tachycardia are serious forms that may cause weakness, collapse, or sudden death. Often secondary to DCM or other structural disease.

Electrical system disorder

Pericardial Disease

Fluid or masses accumulate in the sac surrounding the heart, compressing it and preventing normal filling. Can be caused by tumors (hemangiosarcoma), infection, or idiopathic causes. Often presents as sudden weakness or collapse. More common in large breeds.

Sac around the heart

Heartworm Disease

Parasites transmitted by mosquitoes lodge in the heart and pulmonary arteries, causing severe damage. This is preventable with monthly medication but expensive and dangerous to treat once established. See our guide to heartworm prevention for dogs.

Parasitic & preventable

Congenital Heart Diseases

Congenital defects are present from birth and often detected in puppies during their first veterinary exams. Some cause no problems and require no treatment; others are life-threatening without intervention.

Patent Ductus Arteriosus (PDA): A blood vessel that should close after birth remains open, causing abnormal blood flow. Common in small breeds and often correctable with surgery if caught early. One of the most treatable congenital defects.
Pulmonic Stenosis: Narrowing of the valve between the right ventricle and pulmonary artery, forcing the heart to work harder. Common in Bulldogs, Boxers, and other brachycephalic breeds. Severity varies widely.
Aortic Stenosis: Narrowing of the valve between the left ventricle and aorta. Common in large breeds like Golden Retrievers and Rottweilers. Can cause sudden death in severe cases; milder cases may only need monitoring.
Ventricular Septal Defect (VSD): A hole in the wall between the ventricles, allowing blood to mix between the left and right sides. Small defects may close on their own; large ones require surgical repair.
Tetralogy of Fallot: A complex combination of four defects that reduces oxygen delivery to the body. Rare but serious; may cause cyanosis (blue gums) and stunted growth. Surgical correction is possible in specialized centers.

Breed predisposition matters. If you are bringing home a puppy from a breed with known cardiac issues, ask the breeder about health testing of the parents. Our guide to health testing for dog breeders explains what to look for, and our resources on finding a reputable breeder can help you avoid heartbreak down the line.

Early Warning Signs & Symptoms

Heart disease in dogs is insidious — it develops gradually, and dogs are remarkably good at hiding discomfort. Many owners dismiss early signs as "just getting older." But recognizing these subtle changes can lead to an earlier diagnosis and much better outcomes.

Early Signs (Often Missed)

Reduced exercise tolerance: Your dog slows down on walks, lags behind, or wants to stop sooner than usual. They may still enjoy walks but tire more quickly.
Reluctance to play: A dog who used to fetch for 20 minutes now quits after 5. This is often the first sign owners notice.
Increased sleeping: Sleeping more than usual, or seeming lethargic during the day. Dogs with heart disease often tire easily.
Mild cough: A soft, occasional cough — especially after exercise or at night — can indicate an enlarged heart pressing on the airways.
Heart murmur detected by your vet: This is often the very first clue, found during a routine exam. A murmur is the sound of turbulent blood flow and is graded on a scale of 1-6.
Subtle weight changes: Some dogs lose muscle mass; others gain weight from fluid retention. A changing body condition score warrants investigation.

Advanced Signs (Require Immediate Attention)

Persistent cough: A chronic, productive cough that worsens at night or when lying down. Often indicates fluid in the lungs (pulmonary edema).
Difficulty breathing: Labored breathing, rapid breathing at rest, or abdominal effort (using belly muscles to breathe). Count resting breaths — over 30 per minute is concerning.
Fainting (syncope): Sudden collapse, often triggered by excitement or exertion. Indicates the brain is not getting enough blood flow.
Blue or pale gums: Indicates poor oxygenation. This is an emergency.
Distended abdomen: Fluid accumulation in the belly (ascites) from right-sided heart failure. The belly looks bloated and feels tight.
Swelling in the limbs: Fluid buildup in the legs and paws, especially in the hind legs.
Loss of appetite and weight loss: Advanced heart disease causes cachexia (muscle wasting) despite adequate food intake.

How to count resting respiratory rate (RRR):

When your dog is asleep or resting quietly, count the number of breaths (in and out = 1 breath) over 30 seconds, then multiply by 2. Normal is under 30 breaths per minute. A consistent rate above 30 — or a sudden increase — may indicate fluid in the lungs and warrants a call to your vet. This is one of the most valuable at-home monitoring tools for dogs with heart disease.

Keep a daily log, especially if your dog has been diagnosed. Trends matter more than single readings.

Important: Many of these symptoms overlap with other conditions — kennel cough, tracheal collapse, obesity, and arthritis. Never assume heart disease without veterinary diagnosis. But do not ignore persistent changes either. If your dog is showing any of the advanced signs, contact your veterinarian or an emergency clinic immediately.

Causes & Risk Factors

Heart disease in dogs usually results from a combination of genetics, age, and environmental factors. Understanding the risk factors helps you know what to watch for — especially if your dog belongs to a high-risk group.

Genetics & Breed Predisposition

Certain breeds have a much higher risk of developing specific heart conditions. If your dog is on this list, regular cardiac screening is wise:

Condition	Most Affected Breeds	Typical Age of Onset
Mitral Valve Disease (MVD)	Cavalier King Charles Spaniel, Dachshund, Miniature Poodle, Shih Tzu, Pomeranian, Chihuahua	Middle age to senior (Cavaliers as early as 2-4 years)
Dilated Cardiomyopathy (DCM)	Doberman Pinscher, Great Dane, Boxer, Irish Wolfhound, Golden Retriever, Cocker Spaniel	Middle age (4-8 years)
Pulmonic Stenosis	English Bulldog, Boxer, French Bulldog, Beagle	Congenital — detected in puppies
Aortic Stenosis	Golden Retriever, Rottweiler, Newfoundland, Boxer	Congenital — detected in puppies
Patent Ductus Arteriosus (PDA)	Poodle, Maltese, Pomeranian, Shetland Sheepdog, German Shepherd	Congenital — detected in puppies

Age and Other Risk Factors

Age: The risk of acquired heart disease increases significantly after age 7. Senior dogs should be screened annually, ideally with a cardiac-focused exam.
Obesity: Excess weight forces the heart to work harder and is linked to worse outcomes in dogs with heart disease. Maintaining a lean body condition is one of the most protective things you can do. See our resources on healthy dog weight management.
Dental disease: Chronic gum inflammation allows bacteria into the bloodstream, which can infect the heart valves (endocarditis). Regular dental care is heart care. Our guide to dog dental care at home explains how to brush and what to watch for.
Diet: Grain-free diets high in legumes (peas, lentils) have been associated with an increased risk of DCM in some dogs, according to FDA investigations. Always discuss diet with your vet, especially for large breeds. Our guide to choosing dry dog food covers how to evaluate formulas.
Heartworm infection: A preventable cause of severe heart and lung damage. Year-round prevention is essential. Learn more in our heartworm prevention guide.
Infections: Bacterial endocarditis (infection of the heart valves) is rare but serious. It often originates from dental or skin infections.

How Vets Diagnose Heart Disease

Diagnosis is usually a multi-step process. Not every dog needs every test; your veterinarian will start with the least invasive options and escalate as needed. Early and accurate diagnosis is key to effective treatment.

Physical examination: Your vet listens to the heart for murmurs and arrhythmias, checks the pulse, and evaluates breathing sounds. A murmur is graded 1-6, with higher grades indicating more turbulence. Palpating the chest can reveal an enlarged heart.
Chest X-rays (radiographs): Show the size and shape of the heart, and whether there is fluid in the lungs (pulmonary edema) or around the heart. This is often the first diagnostic test after a murmur is heard.
Electrocardiogram (ECG/EKG): Records the heart's electrical activity to detect arrhythmias and identify chambers that may be enlarged. Quick, non-invasive, and especially important if your dog has fainted or has an irregular rhythm.
Echocardiogram (cardiac ultrasound): The gold standard for diagnosing heart disease. It shows the heart's structure in real time — valve thickness and function, chamber size, muscle wall thickness, and pumping ability. It can measure ejection fraction and identify specific defects.
Blood tests: A complete blood count and chemistry panel rule out other causes (anemia, infection, organ dysfunction). A specific test called NT-proBNP can detect heart muscle stress and help differentiate cardiac from respiratory causes of coughing.
Blood pressure measurement: Hypertension can contribute to or result from heart disease. It is important to know your dog's blood pressure, especially in cases of kidney disease or hyperthyroidism (in older dogs).

If your dog has a murmur: Not all murmurs are serious. Puppies often have innocent murmurs that disappear by 4-6 months. Adult dogs with murmurs should have them evaluated — a low-grade murmur in a small breed may be monitored for years, while a new murmur in a large breed warrants prompt investigation. Our guide to when to see a specialist for behavior issues parallels this principle: early specialist input can make a big difference.

Stages of Heart Failure

Veterinarians use a standardized classification system (ACVIM consensus guidelines) to stage heart disease. This helps guide treatment decisions and gives owners a clearer picture of what to expect. The stages run from A (at risk) to D (advanced heart failure).

Stage A

Dog is at risk for heart disease (based on breed or genetics) but has no structural abnormality or symptoms.

At risk

Stage B1

Structural heart disease is present (e.g., murmur) but there is no heart enlargement and no symptoms.

Asymptomatic, no enlargement

Stage B2

Structural disease is present with heart enlargement, but still no clinical symptoms. Treatment may be started to slow progression.

Asymptomatic, enlarged

Stage C

Clinical symptoms of heart failure are present (cough, difficulty breathing, fatigue). Requires active medical management.

Symptomatic

Stage D

Advanced heart failure that is refractory (not responding well) to standard treatment. Requires aggressive, often specialized, care.

Advanced / refractory

Understanding the stage helps you ask the right questions: Is treatment recommended now, or is monitoring sufficient? What signs should prompt a call to the vet? What is the goal of treatment at this stage? Your vet can explain exactly where your dog falls and what to expect.

Treatment Options

Treatment for heart disease in dogs depends on the specific condition, its stage, and the individual dog. There is no one-size-fits-all protocol. The goals are consistent: reduce the heart's workload, control symptoms, slow progression, and maintain quality of life.

Medications

Pimobendan (Vetmedin): A cornerstone of heart failure treatment. It increases the heart's pumping strength and dilates blood vessels, improving efficiency. Shown to extend survival in dogs with DCM and MVD. Often used long-term.
ACE inhibitors (e.g., enalapril, benazepril): Lower blood pressure and reduce fluid retention by relaxing blood vessels. A mainstay of heart failure therapy.
Diuretics (e.g., furosemide/Lasix): Remove excess fluid from the lungs and body. Essential for managing congestive heart failure. Dosage is adjusted based on breathing rate and clinical signs.
Spironolactone: A potassium-sparing diuretic that also blocks aldosterone, a hormone that worsens heart failure. Often used in combination with furosemide.
Beta-blockers (e.g., atenolol, carvedilol): Slow the heart rate and reduce the work of the heart, especially useful for arrhythmias.
Anti-arrhythmic drugs (e.g., sotalol, amiodarone): Control abnormal heart rhythms that can cause weakness or sudden death.
Sildenafil (Viagra): Used to reduce pulmonary hypertension (high blood pressure in the lungs) that can complicate heart disease.

Procedures and Surgery

Some congenital heart defects can be corrected surgically or with minimally invasive procedures — often with excellent long-term outcomes if performed before permanent damage occurs:

PDA closure: Surgical ligation or catheter-based closure of the patent ductus arteriosus. Highly successful and often curative if done early.
Balloon valvuloplasty: For pulmonic or aortic stenosis, a catheter with a balloon is used to stretch the narrowed valve. Specialized procedure available at referral centers.
Pericardiocentesis: Draining fluid from the sac around the heart for pericardial effusion. Provides rapid relief and can be life-saving in an emergency.
Pacemaker implantation: For complete heart block and certain severe arrhythmias. Available at specialized veterinary cardiology centers.

Treatment is a partnership. Most heart medications must be given on a strict schedule — missing doses can worsen symptoms quickly. If cost or scheduling is a concern, talk to your vet about options before stopping medication. Never discontinue or adjust dosages without veterinary guidance. Your vet can help you prioritize and budget, and they understand that some dogs respond well to lower-cost protocols.

Diet & Exercise Management

Nutrition and activity are powerful tools for supporting a dog with heart disease. They are not a replacement for medication, but they can improve comfort, energy, and quality of life significantly.

Dietary Considerations

Sodium restriction: The most important dietary change for congestive heart failure. Excess sodium causes fluid retention and worsening congestion. Your vet may recommend a prescription cardiac diet, or guide you on homemade meals. Many owners find that homemade food for senior dogs with sensitive stomachs can be adapted, but only under veterinary supervision.
Omega-3 fatty acids (EPA/DHA): Shown to reduce inflammation, improve appetite, and support heart muscle function. Often recommended for dogs with DCM and heart failure. Sources include fish oil supplements and diets enriched with omega-3s.
Taurine and L-carnitine: Amino acids important for heart muscle health. Some dogs with DCM (especially Cocker Spaniels) may have deficiencies. Supplementation may be recommended, particularly for dogs with diet-associated DCM.
Weight management: Maintaining a lean body condition reduces the workload on the heart. If your dog is overweight, a gradual weight loss plan is beneficial. If your dog is losing weight from cardiac cachexia (muscle wasting), nutrient-dense food and appetite stimulants may be needed.
Avoid grain-free diets unless directed: The FDA investigated a link between grain-free, legume-rich diets and DCM in dogs. Unless your vet has specifically recommended one for another reason, choose a diet with grains or consult your vet. Our guide to dry dog food explains how to evaluate formulas.

Treats count, too. Many commercial dog treats are high in sodium. If your dog is on a low-sodium diet, choose low-sodium treats or use small pieces of fresh vegetables (carrots, green beans) as rewards. Our guide to vet-approved homemade training treats includes options you can adapt to be heart-healthy. Also check our dog treats section for guidance.

Exercise Guidelines

Exercise is important for maintaining muscle tone and quality of life, but dogs with heart disease need moderation:

Mild to moderate exercise is generally safe and beneficial for dogs with asymptomatic heart disease (Stage B). Short, gentle walks and controlled play are ideal.
Avoid high-intensity or high-endurance activities — vigorous fetch, running, hiking on steep terrain, or extended swims may overtax the heart.
Watch for signs of overexertion: excessive panting, lagging behind, reluctance to continue, or collapse. Stop immediately and let your dog rest.
In Stage C (symptomatic heart failure), exercise should be guided by your vet. Some dogs benefit from short, frequent walks; others may need rest and only gentle activity. Your vet can help you find the right balance.
Weather matters: Hot or humid weather puts extra strain on the heart. Exercise in the early morning or evening, and always bring water.

If your dog is on a cardiac diet or exercise restriction, talk to your vet about how to maintain muscle mass and mental stimulation. Puzzle toys and scent games can provide enrichment without physical exertion — see our guide to puzzle toys for dogs for ideas.

Prognosis & Life Expectancy

Prognosis for dogs with heart disease varies widely depending on the condition, the stage at diagnosis, and how well the dog responds to treatment. It is important to have honest conversations with your vet, but also to remember that "prognosis" is a statistical average — many dogs exceed expectations.

General Outlook by Condition

Asymptomatic MVD (Stage B1/B2): Many dogs live for years after diagnosis without symptoms. The onset of symptoms (Stage C) is the major turning point. Some small-breed dogs live 2-4 years or more after developing congestive heart failure with treatment.
DCM (asymptomatic): Dogs with DCM often have a more guarded prognosis than MVD. Some can be asymptomatic for months, but progression to heart failure or sudden death from arrhythmia is a risk. Early treatment can slow progression.
Congestive heart failure (Stage C): With treatment, many dogs have a good quality of life for 6-18 months; some live longer. Regular monitoring and medication adjustments are essential.
Congenital defects: Correctable defects (like PDA) have an excellent prognosis if fixed early. Others (like severe aortic stenosis) carry a risk of sudden death, even in seemingly healthy dogs.

Life expectancy is not the only measure that matters. Quality of life — appetite, comfort, ability to enjoy walks and family time — is equally important. Your vet can help you assess your dog's quality of life using standardized tools and guide you on when to consider euthanasia if suffering becomes unmanageable. This is a painful topic, but planning ahead can reduce stress during difficult times.

A note on hope: Veterinary cardiology has advanced significantly in recent decades. Medications like pimobendan have extended survival times and improved quality of life for many dogs. New treatments are always being developed. A diagnosis of heart disease is not a death sentence — it is a call to action.

Prevention & Monitoring

Not all heart disease can be prevented, but you can significantly reduce risks and catch problems early:

Regular wellness exams: Annual checkups (twice yearly for seniors) allow your vet to listen for murmurs and detect problems before symptoms appear. For high-risk breeds, ask about cardiac screening.
Maintain a healthy weight: Obesity strains the heart and worsens outcomes. Feed portion-controlled meals, limit treats, and keep your dog active. Our weight management guide has practical tools.
Daily dental care: Brush your dog's teeth and schedule professional cleanings as recommended. Healthy teeth mean a healthy heart. See our dog dental care guide.
Heartworm prevention: Year-round prevention is essential. See heartworm prevention for dogs for options.
Feed a balanced diet: Choose a diet that meets AAFCO standards and is appropriate for your dog's life stage. Avoid grain-free or legume-heavy diets unless specifically recommended by your vet. Our guide to dry dog food explains how to read labels.
Monitor resting breathing rate at home: Especially valuable if your dog has been diagnosed with heart disease. Keep a log — an upward trend is an early warning sign of fluid buildup.
Avoid unnecessary stress: For dogs with advanced heart disease, stressful situations (loud noises, travel, dog parks) can trigger worsening symptoms. Provide a calm environment. Our resources on anxiety wraps and calming products can help.
Ask about breed-specific screening: If you have a breed predisposed to DCM or MVD, talk to your vet about baseline echocardiograms or genetic testing. Our guide to health testing for dog breeds covers what tests are available.

Know the emergency signs: Difficulty breathing, collapse, blue gums, or a resting breathing rate over 40 breaths per minute require immediate veterinary attention. Do not wait. Keep your vet's emergency contact number and the nearest 24-hour clinic saved on your phone.

Frequently Asked Questions

What are the early signs of heart disease in dogs?

Early signs include a persistent cough (especially at night or after exercise), reduced exercise tolerance, rapid or labored breathing, fatigue, and sometimes fainting. Many dogs show subtle changes first, such as slowing down on walks or sleeping more. A heart murmur detected by your vet is often the earliest clue, so annual wellness exams are essential. If you have a high-risk breed, ask your vet about cardiac screening.

What is the most common heart disease in dogs?

Mitral valve disease (MVD) is the most common heart disease in dogs overall, especially in small breeds like Cavalier King Charles Spaniels. In large and giant breeds, dilated cardiomyopathy (DCM) is more common. Both conditions can lead to congestive heart failure if left untreated, which is why early detection matters so much. If you are researching breeds, our resources on healthiest dog breeds can help you understand genetic risks.

Can heart disease in dogs be cured?

Most forms of heart disease in dogs cannot be cured, but they can be managed effectively. Treatment focuses on slowing progression, controlling symptoms, and improving quality of life. With early diagnosis, appropriate medication, and regular veterinary monitoring, many dogs live comfortably for years after diagnosis. Some congenital defects (like PDA) can be surgically corrected and effectively cured if caught early.

How long can a dog live with heart disease?

Life expectancy depends on the type and severity of heart disease, how early it is detected, and how well it responds to treatment. Dogs with early-stage MVD may live several years with proper management. Dogs with congestive heart failure typically have a guarded prognosis, but many live comfortably for 6-18 months or longer with treatment. Regular monitoring and medication compliance are key. Your vet can give you a more specific estimate based on your dog's individual condition and stage.

What should I feed a dog with heart disease?

Dogs with heart disease often benefit from a diet restricted in sodium to reduce fluid retention, and sometimes supplemented with omega-3 fatty acids, taurine, and L-carnitine. Your veterinarian may recommend a prescription cardiac diet. Never change your dog's diet without veterinary guidance, especially if they are on diuretics or other heart medications. Our guide to canned dog food for senior dogs with heart conditions offers some starting points, but always confirm with your vet.

How is heart disease diagnosed in dogs?

Diagnosis typically involves a physical exam (listening for murmurs or arrhythmias), chest X-rays to assess heart size and lung fluid, an electrocardiogram (ECG) to check heart rhythm, and an echocardiogram (ultrasound) to evaluate heart structure and function. Blood tests help rule out other conditions and monitor organ function. Your vet may refer you to a veterinary cardiologist for advanced imaging or specialized treatment.

Are grain-free diets linked to heart disease in dogs?

The FDA investigated a potential link between grain-free diets (especially those high in legumes like peas and lentils) and dilated cardiomyopathy (DCM) in dogs. While the exact relationship is still being studied, many veterinary cardiologists recommend avoiding grain-free diets unless there is a specific medical reason (like a diagnosed grain allergy). If your dog is on a grain-free diet, discuss it with your vet. Our guide to dry dog food explains how to evaluate formulas.

Can I exercise my dog with heart disease?

Yes, but moderation is key. Dogs with asymptomatic heart disease generally benefit from gentle, regular exercise like short walks and controlled play. Avoid high-intensity activities that leave your dog gasping or exhausted. For dogs with symptomatic heart failure, exercise should be guided by your vet. Watch for signs of overexertion and stop if your dog seems uncomfortable. Mental stimulation through puzzle toys and scent games can help keep your dog engaged without physical strain.

Is heart disease in dogs painful?

Heart disease itself is not typically painful, but the symptoms — difficulty breathing, coughing, fatigue — can cause distress and discomfort. Dogs with advanced heart failure may feel anxious or short of breath. Treatment aims to relieve these symptoms and improve comfort. If you notice signs of pain or distress (restlessness, inability to settle, labored breathing), contact your vet promptly.

Bottom Line: Early Action Makes a Difference

Heart disease in dogs is common, especially in older pets and certain breeds, but it is not a hopeless diagnosis. Modern medications can slow progression and keep dogs comfortable for months or years. The single most important thing you can do is pay attention: schedule annual wellness exams, watch for subtle changes in energy and breathing, and act quickly if something seems off. If your dog has been diagnosed, follow your vet's treatment plan closely and keep a daily log of resting breathing rate — it is one of the simplest and most powerful monitoring tools available. For more on keeping your dog healthy, explore our dog care resources, including guides on dog health and dog vitamins.