Roundworm lifecycle (Toxascaris leonina) Approximately weeks after infection, adult roundworms release eggs in the dog's small intestine. Eggs develop in the environment and become infective approximately 1 week after being passed in feces. Infective eggs may be ingested by your pet directly from the environment. "In the dog, the roundworm undergoes a complicated life cycle." In the dog, the roundworm undergoes a complicated life cycle before mature roundworms are found in the intestinal tract. This involves several stages and includes migration through various bodily tissues.
Adult Worms In dogs, the cysts are "reactivated" by pregnancy. The worms then migrate to the milk glands to be passed to a puppy. In cats and puppies, the worms reach sexual maturity right away in the intestines, without the encysting stage. Nov 26, · These encysted roundworm larvae can remain dormant for the rest of the dog’s life—unless the dog is a female and becomes pregnant, at which time the larvae .
Jun 18, · While in the intestine, adult roundworms shed eggs that then get passed into the environment through an infected dog’s feces. Other dogs can become infected by sniffing or licking infected feces or soil, plants or other objects that have been contaminated by infected feces. From Eating Contaminated Animals. Roundworms are parasitic worms that live as adults inside a dog’s intestinal tract. There they feed on partially digested food passing through a dog’s digestive system. The two main species of roundworms that infect dogs are Toxocara canis and Toxascaris leonina. Toxocara canis is more common and more likely to cause serious disease in dogs.