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Heartworm is a parasitic worm that lives in the heart and pulmonary arteries of an infected animal. The worms travel through the bloodstream—harming arteries and vital organs as they go—ultimately completing their journey to the vessels of the lung and the heart chamber about six months after the initial infection. Several hundred worms can live in one dog for five to seven years.
Heartworm disease is serious and can be fatal.

Heartworm Symptoms
Symptoms of heartworm can include:
Laboured breathing - Coughing - Vomiting - Weight loss, listlessness and fatigue after only moderate exercise - Some dogs exhibit no symptoms at all until late stages of infection

Heartworm Causes
Heartworms are transmitted from animal to animal by mosquitoes. An animal must carry at least two heartworms (a male and a female) in order for female heartworms to reproduce.
Females produce babies called “microfilaria,” which are shed into an animal’s bloodstream but are not capable of directly causing heartworm without first passing through a mosquito.

Microfilariae must be taken up by biting mosquitoes, and transform into infective larvae over a two-week period inside the insect. When a mosquito next bites a susceptible animal, the infective larvae enter the tissues and begin a migration into the blood vessels. Heartworms enter an animal’s bloodstream as tiny, invisible larvae, but can reach lengths of more than twelve inches at maturity.

Diagnosing Heartworm
Heartworm disease is diagnosed by examination, radiographs or ultrasound, and a veterinarian-administered blood test. All dogs should be routinely screened with a blood test for heartworm either annually in spring or before being placed on a new prescription for a heartworm preventative.

Dogs More Prone to Heartworm
Heartworm infestation can happen to any dog, but since mosquitoes are their carriers, dogs who live in hot, humid regions are at greatest risk. The disease has been seen in every state except Alaska, but is most common in or on the East Coast, southern United States and Mississippi River Valley.

Preventing Heartworm
Heartworm is easily preventable with an inexpensive, chewable pill or topical medication available as a vet’s prescription. The pills or topical are usually administered monthly and can be given to dogs under 6 months of age without a blood test. Older animals must be screened for the disease prior to starting medication.

The American Heartworm Society recommends keeping your dog on the medication all year long. Not only does this avoid errors, but many of the products also prevent other intestinal parasites. Please contact your veterinary immediately.

Heartworm Treatment
After diagnosis, a thorough examination of the infected dog should be conducted to evaluate the best course of treatment and the potential risks involved. The most common course of treatment is a series of injections of drugs called adulticides into the dogs’ muscle.

This cure has a high success rate and usually requires hospitalization. All treatment protocols require several weeks of exercise restriction after treatment and are not without risk. Disease prevention is a much better and safer option. After treatment, your dog should be placed on a preventative medication to reduce the risk of infection.

When to Consult Your Veterinarian
If you notice that your dog’s energy has decreased, he seems ill, or he’s exhibiting any of the general symptoms described.

Reference: RSPCA

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