Here’s how this happens: The canine roundworm has unfortunately evolved a very efficient way to propagate itself. It’s very common for puppies to be born with roundworms, as the larvae are often transmitted from the mother just before birth or through nursing. Younger dogs are especially vulnerable to roundworms because their immune systems are not fully mature yet and they aren’t able to fight off the adult worms as effectively as an adult dog can. The worms can cause malnourishment, which can be especially of concern in a small puppy. ( Joel Mills /Creative Commons)Īdult roundworms live in the dog’s intestinal tract, where they feed on partially digested food. The canine roundworm Toxocara canis can be up to several inches long. Toxocara canis causes more serious disease and can be transmitted to humans.
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