Salmon Poison

Salmon Poisoning can be a life-threatening disease to dogs, coyotes, and foxes. The classic symptoms are enlarged lymph nodes, fever, diarrhea, and vomiting. However, they do not always follow this classic pattern and cases are sometimes tricky. The disease is diagnosed by visualizing fluke eggs in a stool sample. In some cases, the stool is so watery that even getting a stool sample is difficult and the diagnostic procedure can be prone to false negatives. Having a history of the dog having eaten raw salmon or trout within the last 1-2 weeks also helps make the diagnosis.

The disease process is interesting because the fish itself doesn’t cause the disease. There is a parasite within the fish known as a fluke (specifically Nanophyetus salmincola), BUT the fluke itself also doesn’t cause the disease, rather bacteria (Neorickettsia helminthoeca) within the fluke THAT CAUSE the DISEASE. Once the larval flukes reach the dog’s intestinal tract, they embed in the dog’s duodenal mucosa, and release the rickettsiae. The rickettsial organisms then spread through the bloodstream to the liver, lungs, brain, and lymphoid tissue.