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A common parasite of dogs in many parts of the world that occurs in other animals, including cats, but rarely infects humans. The adult worms, which are up to 10 inches (25 cm) in length, typically live in the dog's pulmonary artery and right side of the heart. Inflammation and thickening of the heart may result in heart failure, respiratory insufficiency, chronic cough, and vomiting. The disease can be fatal. The female worms produce microfilariae that are found in the dog's blood.
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