Congestive Heart Failure (CHF) in Dogs

Has your dog been coughing a lot and having difficulty breathing? The culprit could be congestive heart failure (CHF). Rather than being its own disease, CHF in dogs is the endpoint of progressive heart disease, occurring when the heart can no longer pump blood efficiently throughout the body, leading to fluid buildup in the lungs, abdomen, or chest cavity.

The coughing and breathing difficulties can be alarming for pet parents. Fortunately, CHF can be managed with medications and lifestyle changes, helping dogs live for months or even years with a relatively good quality of life. In this article, we’re answering some of the most common questions that pet parents have about CHF in dogs.

Q1: What is congestive heart failure in dogs?

Congestive heart failure in dogs is the end stage of heart disease. It develops gradually, with the heart slowly becoming less able to pump blood throughout the body, causing fluid to back up in the lungs or abdomen, depending on which side of the heart is affected.

Left-sided CHF is the most common and occurs when blood in the left ventricle leaks back up into the left atrium through the mitral valve. Fluid then leaks into the lungs, causing persistent coughing and breathing difficulties.

Right-sided CHF occurs when blood leaks from the right ventricle up into the right atrium through the tricuspid valve, causing a fluid buildup in the abdomen.

CHF tends to be more common in older and certain breeds. For example, small-breed dogs, such as Toy Poodles, are prone to mitral valve dysfunction. Large-breed dogs, such as Dobermans, are at risk for CHF because they are predisposed to dilated cardiomyopathy, a condition of dilated heart muscles that weakens the heart.

Q2: What are the symptoms of congestive heart failure in dogs?

Congestive heart failure symptoms in dogs are not specific to this condition. The two most common symptoms are persistent coughing and difficulty breathing. Other symptoms are listed below:

• Exercise intolerance, tiring easily
• Lethargy or weakness
• Decreased appetite
• Distended abdomen from fluid buildup
• Collapse
• Fainting, in severe cases

Symptoms depend on which side of the heart is affected and how much of the heart’s pumping capacity has been lost.

Breathing difficulty should always be treated as a veterinary emergency.

Q3: What causes congestive heart failure in dogs?

In many cases, CHF in dogs is caused by a congenital heart condition, such as mitral valve insufficiency in small breed dogs and DCM in larger breeds.

Acquired diseases, such as heartworm, bacterial infections, and parvovirus, can also cause CHF. Irregular heart rhythms, called arrhythmias, can contribute to CHF.

Age and breed can increase the risk of heart disease.

Interestingly, the heart can compensate for decreased pumping capacity by increasing heart rate and thickening the heart muscle. However, these adjustments are temporary. The pumping capacity will continue to decrease, leading to CHF.

Q4: How is congestive heart failure diagnosed?

Given that the symptoms of CHF are non-specific, a veterinary diagnosis is required to confirm the condition. During a physical examination, the veterinarian will listen closely to the heart for heart murmurs. They will also listen to the lungs and check the abdomen for swelling.

Various diagnostic tests can help confirm the diagnosis:

• Chest X-rays to evaluate heart size and fluid in the lungs
• Echocardiogram (heart ultrasound)
• Electrocardiogram to check for arrhythmias
• Blood pressure
• Bloodwork

Diagnostic testing will allow your veterinarian to assess the type and severity of heart disease and determine the most appropriate course of treatment.

Q5: How is congestive heart failure treated in dogs?

CHF in dogs can be managed, but not cured, with medication and lifestyle changes. The main goals of treatment are to reduce fluid buildup and maximize the heart’s pumping capacity.

Diuretics, such as furosemide, are used to reduce fluid buildup. Several types of heart medications are available to improve circulation and heart function.

Dogs with severe breathing difficulties need to be hospitalized to receive oxygen supplementation.

In some cases, a low-sodium diet is needed to preserve heart function. Finally, modifying physical activity and regularly monitoring symptoms are important management strategies for CHF. Let your veterinarian know if your dog’s symptoms are not improving with treatment.

CHF treatment is lifelong and individualized according to a dog’s heart condition and overall health.

Q6: How can owners help dogs with congestive heart failure live comfortably?

Dogs with CHF can enjoy a good quality of life for months or even years. As a pet parent, you can do several things to help your dog live a good life with CHF:

• Give medications exactly as prescribed. Ask your veterinarian if you’re unsure about how to give them.
• Monitor resting breathing rate at home. If your dog's breathing rate changes or their breathing becomes more labored, seek veterinary care immediately.
• Keep your dog’s follow-up veterinary appointments. Your vet will need to monitor your dog closely and regularly. Make sure to keep all appointments.
• Avoid excessive heat, humidity, or strenuous activity. It is important to avoid anything that could overload your dog’s reduced heart function.
• Watch for worsening coughing, fatigue, or appetite changes. Report any worsening symptoms to your veterinarian.

Dogs with CHF Can Still Live Fulfilling Lives

CHF in dogs is a progressive condition resulting from gradually worsening heart disease. It is a serious condition that requires close monitoring and lifelong medication to manage. Early diagnosis, medications, and regular veterinary monitoring help dogs with CHF enjoy a good quality of life and remain relatively comfortable and active.

Contact your veterinarian immediately if you notice worsening symptoms, such as persistent coughing, breathing difficulties, or exercise intolerance. Despite CHF being progressive, many dogs with the condition can continue to enjoy meaningful time with their families through proper management and supportive care.