worming | Companion Animal Veterinary Hospital
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Heartworm Prevention- What you need to know!

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Heart and Lungs at necropsy with heartworm


What is Heartworm?

Heartworm (Dirofilaria immitis) is a potentially fatal worm that is spread by mosquitoes and affects dog and cats. When a mosquito bites the animal,  heartworm larvae are injected into the skin . The larvae then develop into small immature worms that travel to the right side of the heart via the peripheral veins. The worms become mature approximately 6 months after infecting an animal and can reproduce inside the infected animal. Heartworms can grow up to 10-30cm long and live for up to 5 years. A dog can be infected with up to 250 worms!

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