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Frequently Asked Questions
What are the signs of heartworm disease in dogs?
Early on, heartworm disease may not show any signs at all. As the condition progresses, you may notice symptoms like a persistent cough, fatigue after mild activity, decreased appetite, and weight loss. In advanced cases, dogs can develop heart failure or have a swollen belly due to excess fluid. Prompt prevention and regular testing are key, since by the time symptoms appear, significant damage may have already occurred.
How do dogs get heartworms?
Dogs become infected when bitten by a mosquito carrying heartworm larvae. Once inside the dog’s body, the larvae migrate through the bloodstream and eventually mature in the heart and lungs. Because mosquitoes can travel and breed easily, no dog regardless of where they live is completely immune to the risk.
Is heartworm prevention needed year-round?
Yes. Even in colder months, mosquitoes can survive indoors or during unexpected warm spells. Skipping doses—even briefly—can leave your dog unprotected. Consistent, year-round prevention is the most effective way to avoid infection and safeguard your dog’s health.
Can heartworm disease be treated in dogs?
Yes, but treatment is complex, costly, and can be hard on your dog. It involves a strict protocol of medication, exercise restriction, and close monitoring. That’s why prevention is always the better, safer, and more affordable option. When in doubt, talk to your vet about the best heartworm preventative for your dog’s lifestyle.
Are there side effects to heartworm medications?
Heartworm preventatives are generally very safe when given as directed. Mild side effects, if any, may include digestive upset like vomiting or diarrhea. Serious reactions are rare but possible—especially if your dog is already infected with heartworms when the medication is administered. That’s why annual testing is so important before starting or continuing a preventative.
How often should my dog be tested for heartworms?
The American Heartworm Society recommends annual testing, even for dogs on regular prevention. Testing ensures that the medication is working and that your dog remains heartworm-free. It also allows early detection and treatment, should any lapse in protection occur.