But a bacterium called Neorickettsia helminthoeca, which lives inside the fluke, causes salmon poisoning. Symptoms of salmon poisoning include high fever, appetite loss, or depression. Alaria is an intestinal fluke that can infect dogs. Alaria create few, if any, clinical signs unless there is a heavy infection. Dogs contract this parasite when they eat any number of aquatic animals, such as frogs, tadpoles, or snakes.
Most tapeworms usually infect dogs when they ingest fleas or nonaquatic animals.
But in the case of the tapeworm Diphyllobothrium latum, your dog becomes infected by eating a fish that is infected with larval tapeworms. Diphyllobothrium adults can grow up to 30 feet in length. Their eggs are released into water through the feces of an infected dog, fox, mink, or even bear. The eggs are ingested by copepods, which are eaten by small fish. Diphyllobothrium larvae live within the muscles of fish and are passed up the food chain from fish to fish until they are eaten by a mammal, where they mature in the digestive system and lay eggs that are passed through the feces.