Never feed any RAW fish to a dog.
It MUST be cooked or frozen for a minimum of 2 weeks to kill off parasites which can be deadly. https://oregonvma.org/care-health/sa...soning-disease
Cooked is ALWAYS a better option to make sure. You can just put it in a pan and bake it until it turns white and "flakes" when separating it, and it's done!