Heartworm disease is a serious and potentially fatal condition caused by parasitic worms (Dirofilaria immitis) that live in the heart, lungs, and associated blood vessels of infected dogs. The disease is transmitted through the bite of an infected mosquito. Once a dog is infected, the heartworms can grow up to a foot long and can live for several years.

Symptoms of heartworm disease can vary but often include coughing, difficulty breathing, fatigue, and weight loss. In more severe cases, it can lead to heart failure and other serious health issues.

Preventive measures are essential, as treatment for heartworm disease can be complicated and costly. Here are some tips for prevention:
1. **Monthly Preventive Medications**: Administer heartworm preventive medications regularly, as recommended by your veterinarian. These can come in the form of chewable tablets, topical treatments, or injections.
2. **Regular Testing**: Have your dog tested for heartworms annually, especially if they are on preventive medication. Early detection can make treatment more effective if an infection occurs.
3. **Mosquito Control**: Reduce mosquito exposure by keeping your dog indoors during peak mosquito activity times (dawn and dusk), using mosquito repellent products safe for dogs, and eliminating standing water around your home where mosquitoes breed.
4. **Awareness**: Be aware of the prevalence of heartworms in your area and discuss with your veterinarian the best prevention strategies for your dog.

By taking these precautions, you can help protect your dog from heartworm disease and ensure their long-term health and well-being.

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Topics covered in this question:

Dog Health Parasites Preventive Care Veterinary Advice Heartworm