Tapeworms called Echinococcus multilocularis use canids as their definitive, or “normal,” hosts. That means they complete their life cycle in dogs, coyotes, foxes or wolves without causing them many problems. But once these animals pass egg-laden feces into the environment, rodents, rabbits, hoofed mammals and even humans can become infected.
In an abnormal host, the parasite can’t complete its life cycle and instead becomes trapped in the body where it travels to various organs. The subsequent tumor-like growths can cause all sorts of problems.
This isn’t just an issue for other animals. Young children and immunocompromised people are especially at risk.
Pet parents can help by using a monthly pet dewormer that’s effective against tapeworms — and by cleaning up after their pets.