Treatment for heartworm disease in dogs is both harsh and expensive. This requires multiple visits to the veterinarian for lab work and injections of an arsenic-based medication. Some older dogs or those with other pre-existing health conditions may not even be candidates for heartworm treatment. Undergoing heartworm treatment is stressful on the health of any dog, but especially for those whose health is already compromised.
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Owners of Collies, Shelties, OES, Aussies, and some other mixed breed dogs might be sensitive to ivermectin. If you are concerned in any way you can test for the mutation on the MDR1 gene that causes sensitivity. Testing is available though the Washington State University College of Veterinary Medicine, . Of course these dogs can be given heartworm preventatives that do not utilize ivermectin (Revolution (selamectin) and Advantage multi (moxidectin) are both topical so treat fleas as well as preventing heartworm disease). Both of these medications are fairly new and will need to be purchased from your veterinarian.
Natural Heartworm Preventatives for Dogs | petMD
Remember that when you’re choosing the best heartworm medication for dogs, you’re choosing to protect your pet for months and years to come. Consider cost and ease of application, of course, but also consider what will give them the best protection. It is sometimes possible to deworm your pet after they are infected, but it’s better to avoid the necessity of this option altogether when possible.
Heartworm & Flea Prevention for Pets- 1800PetMeds