[anonymous]

https://www.vetmed.wsu.edu/outreach/Pet-Health-Topics/categories/diseases/salmon-poisoning (excerpt below, click on link for full article)
This information is not meant to be a substitute for veterinary care. Always follow the instructions provided by your veterinarian. 
Fishing can be wonderful recreation, but sharing the catch with your dog can be an act of kindness that kills. 
Salmon Poisoning Disease is a potentially fatal condition seen in dogs that eat certain types of raw fish. Salmon (salmonid fish) and other anadromous fish (fish that swim upstream to breed) can be infected with a parasite called Nanophyetus salmincola. Overall, the parasite is relatively harmless. The danger occurs when the parasite itself is infected with a rickettsial organism called Neorickettsia helminthoeca. It’s this microorganism that causes salmon poisoning. 
“Salmon poisoning occurs most commonly west of the Cascade mountain range,” says  Dr. Bill Foreyt, a veterinary parasitologist at Washington State University’s College of Veterinary Medicine. He adds, “Canids (dogs) are the only species susceptible to salmon poisoning. That’s why cats, raccoons and bears eat raw fish regularly with out consequence.” 
Generally clinical signs appear within six days of a dog eating an infected fish.