
What is Heartworm?
Heartworm is a serious and often fatal disease that primarily affects dogs, but can also impact cats and other animals. It is spread through mosquito bites, which transmit parasitic worms called Dirofilaria immitis (Heartworm). Once inside an animal’s bloodstream, these worms pose significant health risks.
As pet owners, it’s essential to understand the signs and symptoms of heartworm disease. Prevention is far easier, faster, and less costly than treatment, so how can you protect your furry friend?
- Ensure your pet has regular veterinary check-ups. Regular visits and communication with your vet allow for early detection and prompt treatment.
- Make sure your pet receives the appropriate heartworm prevention medication. Consult with your vet to determine the best option for your pet.
- Familiarize yourself with the symptoms of heartworm disease.

Early symptoms of heartworm include:
- Fatigue
- Weight loss
- Loss of appetite
- Coughing
- Mobility issues
Advanced symptoms may include:
- Swollen belly
- Dark-colored urine
- Scar tissue in the lungs
- Anemia
- Muscle atrophy
- Fluid in the lungs
- Heart failure
At HSLM, it’s not uncommon for us to care for dogs diagnosed with heartworm disease. In fact, over the last year alone, we have had just short of a dozen dogs testing positive for heartworm. When this happens, we are committed to providing the necessary treatment for their recovery. Thanks to the generosity of our incredible donors, we can offer extensive treatment to these animals.
By becoming a PAW donor, you help us provide lifesaving and long-term care for animals in our care who test positive for heartworm disease. A heartfelt thank you to our current PAW monthly donors for your ongoing support — join them today and make a lasting impact!