How to Deal With Heartworms in Dogs (Part 1)

Heartworms (Latin name Dirofilaria immitis) are parasitic worms that are common in both dogs and cats. Like their name suggests, they live in the dog’s heart, normally free-floating in the right ventricle and nearby blood vessels. The worms are transmitted from dog to dog by mosquitoes which pass the worm larvae through their saliva. The presence of heartworms can be very dangerous to the dog’s health. Although the dog will not display signs of infection until it has progressed considerably, heartworms can be life threatening and are sometimes difficult to detect and diagnose.

Signs of Heartworm Infection

When a dog is first infected with heartworms, there are literally no signs and the presence of heartworms can not be detected even with a blood test. Once the worm larva reaches the heart and matures, however, signs that are detectible by X-ray start to develop almost immediately. These include damage to the blood vessels around the heart and lungs. It is rare that a dog will be infected by only one worm and as the mature worms in the heart grow in size and number, the conditions worsen, eventually causing a blockage of blood flow. It is at this point that the dog will start to display physical signs which can include pain, hypertension, difficulty breathing, lethargy or even fainting. In extremely progressed cases the dog can suffer from heart failure and death although by the time the heartworm disease has reached this stage the owner has probably realized that something is going on and sought veterinary care.

1 2 »