Haddock — Food safety facts
Safe to share · Dogs · full breakdown on the linked food page
Same as cod — plain and cooked, no salt or butter.
The full verdict, portion guidance and serving notes are collected on the Haddock food facts page.
Short answer
The danger isn't from the haddock itself, but from bacterial spoilage. Cooked fish left at room temperature for many hours can grow harmful bacteria that cause food poisoning. While plain, cooked haddock is normally safe for dogs, the 'left out' part changes the risk. Keep a close eye on your dog over the next day for symptoms like vomiting, diarrhea, lethargy, or a painful abdomen. Make sure they have access to fresh water to stay hydrated. If you notice any of these signs, a call to your vet for advice is the best course of action.