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Heartworm: Devastating Facts

Drs. Foster & Smith Educational Staff
Dewormer Comparison Chart 
Dog Deworming Guidelines 
Mosquito Control 
The Heartbreak of Heartworm s
A DOG WITH active heartworm disease has thousands of microfilariae (the immature form of heartworm) circulating in his body along with many adult worms. All heartworm infections do not necessarily include
circulation of adult and juvenile heartworms. These are called occult infections. Occult infections are very difficult to diagnose. Both types of heartworm disease are dangerous to your dog's health.

Diagnosis of heartworm disease is determined by blood tests. The most common blood test detects certain proteins (antigens) on the adult female worm. Another blood test detects antibodies the pet's body has made in an attempt to kill the heartworms. If a blood test is positive, other confirmatory tests including x-rays, ultrasound, and additional laboratory tests are performed.

Many factors influence the severity of a dog's heartworm infection, including:

How many heartworms are circulating

How many heartworms are in the dogs' heart and/or lungs

How long the dog has had the infection

Age of dog

Size of dog

Health status of dog

Dog's activity level

Tri-Heart® Plus Interceptor® Revolution® Heartgard® Plus Once heartworms become numerous, they move into the heart. Adult heartworms live in the right-side chambers of the heart and the vessels leading from the heart to the lungs. Initially, the inflammatory processes of the dog are responsible for a soft cough, some exercise intolerance, and abnormal lung sounds. As the disease becomes more serious, the heart may enlarge and become weak since it must work harder. Additionally, a number of conditions may occur, including congestive heart failure and liver disease. Any of these scenarios can lead to sudden collapse and death.

Heartworm disease, as you can see, is devastating. The good news is that this disease is preventable. To ensure that your dog does not get this disease, we recommend regular testing and heartworm preventives given year 'round.


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