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Posted on 12-07-2017

             

Proper Application of Dog Heartworm Prevention Medication

By Jennifer Kvamme, DVM

Keeping our dogs free of heartworms is much cheaper, easier, and safer than treating them for a full-blown disease. However, it is important that you use heartworm preventives properly — both for your safety and your dog's safety.

Consult Your Veterinarian First

It’s very important that you use only approved heartworm medications, in the correct dosage, for your dog’s particular age, weight, and health status. But before deciding to give a heartworm medication to your dog, ask your veterinarian for advice. A negative heartworm test is required to obtain a prescription for heartworm medication, so you will need to have your dog tested for heartworms first. Also, your veterinarian will only give you a prescription for a heartworm preventive if the dog is shown to have no heartworms (tested negative).

There are several kinds of heartworm preventive medications commonly used today. Many of these preventives have multiple benefits; some also control intestinal parasites as well as external parasites.

Oral Heartworm Medications

Common active ingredients used in heartworm preventives today include ivermectin and milbemycin. Ivermectin has been used for decades to prevent heartworm disease in dogs. There are rarely side effects, if given at the proper dosage, but some dogs may experience vomiting, diarrhea, or incoordination. In the case of an allergic response to the heartworm medication, a dog may experience itching, hives, swelling of the face, or even seizures or shock.

Topical Heartworm Medications

Newer topical or spot-on medications are available to prevent not only heartworms, but also fleas, ticks, mites, and more. Depending on the brand you choose, your dog can be protected from many parasites (internal and external), all in one monthly application. Selamectin and moxidectin work by absorbing into the dog’s skin and collecting in the oil glands under the skin. From there, the drug dispenses slowly over time, protecting the dog.

When applying these types of heartworm medications, you want to be careful not to get it on your skin or in your eyes. The fur in the area between the shoulder blades should be separated, to find the skin below. Apply the liquid directly to the skin instead of to the fur. Wash your hands after handling these medications (or wear disposable gloves so there is no skin contact at all). Label instructions should always be followed carefully. Keep your dog indoors and watch him for about 30 minutes following application. Children and other animals should be kept apart while the heartworm medication is absorbing.Adverse reactions to these preventives are rare, but do occur. Possible side effects may include vomiting, diarrhea, drooling, panting, and trembling. 

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