![]() This means that you will likely see the worms when they pass so be prepared as they can be quite long and may still be alive and moving when you see them. Once it has been passed, it cannot survive in the environment and dies. Medications essentially anesthetize the worm so that it lets go of its grip on the host intestine and passes with the stool. There are two important concepts to keep in mind about deworming. It is very difficult to prevent mother to puppy transmission and routine deworming is not adequate. Note: When dogs are dewormed, this affects only worms in the intestinal tract. Puppies can be infected by drinking their mother's milk, though, due to the intrauterine cycle described above, the litter would probably already be infected. ![]() If the host is a nursing mother, second stage larvae can migrate to the mammary gland instead of the lung after encysting. The second stage larvae make their way to the puppy’s lungs to develop into third stage larvae. If the host is pregnant, the larvae do not migrate to the lung after they encyst instead they come to the uterus and infect the unborn puppies. The worms are coughed up into the host's throat where they are swallowed thus entering the intestinal tract for the second time in their development. When they get to the upper airways, their presence generates coughing. A heavy infection can produce a serious pneumonia. They burrow into the small airways and travel upward towards the host's throat. When the time comes to move on, the larvae encyst and migrate to the host's lungs where they develop into third stage larvae. If the host is a dog, the larvae mostly encyst in the host's liver. ![]() STEP THREE : These second stage larvae can remain encysted happily for years.
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