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Round worm is the most common intestinal parasite in North American dogs. They are visible in feces or vomit. These worms are transmitted either in utero, when a dog eats contaminated food or soil, or when he eats and infected animal - a mouse, for instance. The adults lay eggs, which are passed out in feces and after being outside for a few days become 'activated.' If they are ingested after activation, the eggs will hatch and mature into adults - starting the cycle again. In puppies infected in utero, the worms infect the lungs, are coughed up and swallowed into the digestive system to complete their cycle. Wondering how dogs get worms? With so many methods of infection, it's better to wonder how some dogs don't get worms!

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