February is heart health month and heart disease is one of the most common health concerns affecting both dogs and cats. Early detection can make a life-saving difference. At Animal Emergency Hospital Volusia, DeLand, and Palm Coast, our emergency veterinary teams frequently treat pets experiencing complications related to heart disease, often when symptoms suddenly worsen or become life-threatening.
Because many heart conditions develop gradually, pet owners may not notice warning signs right away. Understanding the most common heart diseases in pets can help you recognize symptoms early and seek veterinary care when your pet needs it most.
1. Degenerative Mitral Valve Disease (DMVD) in Dogs
Degenerative Mitral Valve Disease is the most common heart condition diagnosed in dogs, especially in small and senior breeds. This disease occurs when the mitral valve weakens over time, allowing blood to flow backward within the heart. As the heart works harder to compensate, fluid can eventually build up in the lungs, leading to congestive heart failure.
Symptoms Pet Owners Should Watch For
- Persistent coughing
- Rapid or labored breathing
- Difficulty exercising or tiring easily
- Restlessness, especially at night
- Decreased energy levels
Many dogs live comfortably with mitral valve disease when diagnosed early and properly managed with medication. However, when breathing difficulty or collapse occurs, it requires immediate emergency care.
2. Dilated Cardiomyopathy (DCM) in Dogs
Dilated Cardiomyopathy occurs when the heart muscle becomes weakened and enlarged, reducing its ability to pump blood effectively. This serious condition primarily affects medium and large dog breeds and can sometimes progress without obvious early symptoms.
Warning Signs of DCM
- Weakness or lethargy
- Sudden collapse or fainting
- Rapid or difficult breathing
- Decreased appetite
- Abdominal swelling caused by fluid accumulation
Because DCM can progress quickly, dogs experiencing collapse, breathing distress, or sudden weakness require immediate veterinary attention.
3. Hypertrophic Cardiomyopathy (HCM) in Cats
Hypertrophic Cardiomyopathy is the most common heart disease diagnosed in cats. This condition causes thickening of the heart muscle, making it difficult for the heart to properly fill with blood and circulate oxygen throughout the body. Cat breeds with increased risk of this disease include Maine Coons, Ragdolls, British Shorthairs, and Persians.
Symptoms of Heart Disease in Cats
- Rapid or open-mouth breathing
- Sudden hind leg paralysis or weakness (often caused by a blood clot and considered a medical emergency)
- Lethargy or hiding behavior
- Reduced appetite
Cats are experts at hiding illness, which is why symptoms of heart disease are often advanced by the time they appear. Sudden breathing difficulty or mobility changes should always be treated as an emergency.
4. Heartworm Disease
In addition to structural heart disease, heartworm disease is one of the most serious and preventable threats to heart health in pets living in Florida. Heartworms are spread through mosquito bites, making pets in warm, humid areas like Volusia and Flagler Counties particularly vulnerable year-round.
Once infected, heartworms grow and live inside the heart, lungs, and surrounding blood vessels. Over time, this can cause severe lung disease, heart failure, organ damage, and even death if left untreated.
Symptoms of Heartworm Disease in Dogs
- Persistent coughing
- Exercise intolerance
- Fatigue
- Weight loss
- Difficulty breathing
- Collapse in severe cases
Symptoms of Heartworm Disease in Cats
- Coughing or asthma-like symptoms
- Vomiting
- Loss of appetite
- Difficulty breathing
- Sudden collapse or death in severe cases
Unlike dogs, treatment options for heartworms in cats are limited, which makes prevention extremely important.
Why Heart Disease Can Become an Emergency
Pets with heart disease can appear stable for months or years before experiencing sudden complications. Emergency symptoms can develop quickly and may include:
- Severe difficulty breathing
- Collapse or fainting
- Blue or pale gums
- Sudden paralysis in the hind limbs
- Extreme lethargy or unresponsiveness
If your pet shows any of these symptoms, immediate emergency care is critical. Our experienced teams at Animal Emergency Hospital Volusia, DeLand, and Palm Coast are equipped to provide urgent stabilization, advanced monitoring, oxygen therapy, diagnostic imaging, and lifesaving treatment when cardiac emergencies occur.
Supporting Your Pet’s Heart Health
While not all heart conditions are preventable, pet owners can help support cardiovascular health by:
- Administering heartworm preventatives every month
- Scheduling routine veterinary wellness exams
- Monitoring breathing patterns, energy levels, and appetite
- Maintaining a healthy weight through proper diet and exercise
- Following medication and monitoring plans if your pet is diagnosed with heart disease
- Seeking emergency care if symptoms worsen suddenly
Florida’s warm climate allows pets to stay active year-round, which is excellent for overall wellness but can sometimes make subtle signs of heart disease easier to overlook. Regular veterinary visits remain one of the most important tools for early detection.
We’re Here for You
At Animal Emergency Hospital Volusia, Animal Emergency Hospital DeLand, and Animal Emergency Hospital Palm Coast, we understand how frightening it can be when your pet experiences a medical emergency. Our veterinary team is available to provide urgent care for pets suffering from cardiac distress, breathing emergencies, collapse episodes, and other life-threatening conditions.
We’re proud to support pets and their families throughout Volusia, Flagler, Lake, and Seminole counties. If your pet is showing signs of heart disease or sudden breathing difficulty, do not wait. Emergency evaluation can significantly improve outcomes and help protect your pet’s quality of life.
If you have questions or concerns about your pet’s heart health, don’t hesitate to contact us. We’re here to help 24/7.
Warmest wishes,
Dr. Diane Johnson
Founder, Medical Director