Keep your dog safe from Salmon Poisoning Disease (SPD) 

Salmon and trout carcasses may harbor bacteria in their blood that can be fatal to dogs. Salmon poisoning is caused by the bacteria Neorickettsia helminthoeca which is transmitted through a parasitic flatworm or “fluke”.  Without treatment, salmon poisoning in dogs is often fatal. Symptoms include severe vomiting and diarrhea. Fortunately, with treatment most dogs will survive.
Dog owners should be vigilant about keeping their dogs away from dead fish, especially from September through December. If you see your dog eating a dead salmon or trout, or even around one, take them to the veterinarian right away. Don't wait for your dog to get sick as prophylactic treatments can prevent a more serious illness. The sooner your dog gets treated, the less likely they will get sick and need expensive treatments.