When summer hits full swing, so do the mosquitoes—and they’re more than just annoying. It’s crucial to know how to protect your pet from mosquito-borne illnesses, especially since these pests can carry dangerous diseases like heartworm.

According to the American Veterinary Medical Association (AVMA), even a single mosquito bite can transmit heartworm larvae. These microscopic larvae travel through your pet’s bloodstream and develop into long, spaghetti-like worms that live in the heart and lungs. Heartworm disease can cause severe lung disease, heart failure, and damage to other organs—and left untreated, it can be fatal.

What Can You Do?

The best way to protect your pet from mosquito-borne illnesses is by starting with your veterinarian. Ask about a year-round heartworm preventative. While mosquitoes are most active in warm months, prevention should be maintained all year to ensure continuous protection. Skipping doses—even in winter—can leave your pet vulnerable.

In addition to medication, there are other practical steps you can take:

  • Use only pet-safe mosquito repellents—never human sprays, which can be toxic

  • Eliminate standing water in your yard, such as in flowerpots, birdbaths, or old tires

  • Keep your lawn trimmed and bushes pruned to reduce mosquito hiding spots

  • Avoid walking your dog at dawn or dusk, when mosquito activity peaks

  • Check that window and door screens are intact to keep bugs out of the house

Signs to Watch For

Heartworm disease often develops slowly. Some pets may show no symptoms at first, so annual testing is essential—even for pets on preventatives. Still, watch for early warning signs, including:

  • Persistent coughing or difficulty breathing

  • Fatigue after light activity or exercise

  • Decreased appetite or weight loss

Prevention Is Key

Preventing mosquito-borne illnesses is far easier—and less expensive—than treating them. Heartworm treatment can take months and cost significantly more than a monthly preventative. Keeping your pet safe and bite-free this summer means peace of mind for both of you.

With a few smart precautions and help from your vet, you can enjoy the warm weather while keeping your pet protected.