About Roundworms
Many parasites can infect the digestive system of dogs. The most common ones are described below. Some gastrointestinal parasites of dogs can also cause disease in people.
The large roundworms known as ascarids are common in dogs, especially in puppies. The most important species is Toxocara canis, not only because its larvae may migrate in people, but also because infections are common. Fatal infections may occasionally be seen in young pups. Toxascaris leonina is typically much less common and is generally seen in older dogs.
Source: www.merckvetmanual.com
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