Adults lay eggs in the lungs which are moved out the lungs and coughed up, reswallowed and passed in the feces. Ivermectin may play a roll in treatment but, currently there is no recommended therapy Paragonimus is an infrequent parasite of the dog that exists almost exclusively in the most northern areas of the Midwest and north central Canada. Transmission is by consumption of freshwater crustaceans and snails, acting as an intermediate host. The disease is serious only when the parasite gets into the brain. There is no recommended therapy.
Prevention is by eliminating the consumption of freshwater crustaceans and snails.
Nanophyetus salmincola is a small intestinal fluke acquired by dogs when they consume raw salmon from the northwest. The disease exists only in the northwest. The parasite is mostly innocuous. However, within the parasite a more serious threat lives. Therapy for salmon poising involves supportive care including intravenous fluids and antibiotics.