Heartworm Testing In Dogs

Experts recommend heartworm testing for dogs during late spring or early summer. It is during this time of the year when mosquitoes are very active and are able to transmit the organism that causes heartworm, Dirofilaria immitis. There are 3 developmental stages in the lifecycle of heartworms - adults, microfilariae, and larvae. The adults live in the pulmonary artery and the heart while the microfilariae are present in the peripheral blood. When a mosquito bites an infected animal, they can pick up the microfilariae which eventually mature to stage 3 larvae inside the body of the mosquito. This maturation usually takes about 3 weeks during warmer weather. When the infected mosquito feeds on a susceptible dog, it injects the stage 3 larvae. Inside the body of the dog, it will take 6-7 months for the stage 3 larvae to mature into adult worms. Before a dog is placed on heartworm preventatives, they should undergo testing for heartworm. Ask your veterinarians Oconomowoc, WI about the best way to protect your pet against heartworm disease.