Because of the regional and climate-dependant nature of the heartworm cycle, it is crucial to consult your veterinarian before giving any medication to your pet. Your veterinarian is your best reference, with expert knowledge of the heartworm life cycle and transmission patterns in your region, along with the individual health and activity profile of your dog.
Before starting a preventive program, all dogs that could possibly be affected with mature heartworms should be tested as some preventive medicines may cause severe reactions in dogs that are already hosts to adult heartworms. A dog that is on a preventive medicine should be tested routinely to ensure on going protection- especially when a dose has been missed or forgotten.
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