Start with an annual test to see if your dog is already carrying these deadly worms. If the test is negative, your veterinarian will recommend a preventive heartworm medication. This may be given either once a month or daily. These medications keep heartworms from maturing. Some veterinarians recommend giving your dog the medication year-round, but it should definitely be given during the months when mosquitoes are active.
Allergies are also fairly common among dogs.
Watch your dog for typical allergic reactions, such as excessive scratching, licking or rubbing. The most common allergy is from flea bites. Consult your veterinarian about how best to control fleas, be it collars, shampoos or area foggers. The latest research suggests that fleas spend most of their time on your pet, but are constantly shedding their eggs in the house and yard. This provides a continuous source of re-infestation.