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Canine Heartworm DiseaseDogs are regarded as the definitive host for heartworms (Dirofilaria immitis). However, heartworms can infect more than 30 species of creatures (e.g., coyotes, foxes, wolves and other wild canids, domestic cats and wild felids, ferrets, sea lions, etc.) and individuals too. When a mosquito carrying infective heartworm larvae bites a puppy and transmits the infection, the larvae grow, develop and migrate in the body over a period of many months to become sexually mature male and female worms. These live in the heart, lungs and related blood vessels. As older adults, the worms mate and the females release their offspring (microfilariae), pronounced: (micro-fil-ar-ee-a), into the blood flow.Offspring can be discovered in the bloodstream (pre-patent period) approximately six to seven weeks following the infective larvae from the mosquito go into the dog. The men heartworms (four to six inches in length) and the females (10-12 inches) become completely grown about one year after disease, and their life in dogs appears to average around five to seven years.
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