What happens if a dog eats fish?

Generally, it is fine for a dog to eat fish, and some dogs even love it. However, if a dog accidentally swallows a fish bone, it can get stuck in the throat or intestines, causing choking or indigestion, so remove bones and spines before feeding. Second, be careful with fish heads and organs, which contain high levels of mercury, cadmium, and other heavy metals that can harm the dog. Finally, some fish are oily, and too much can cause diarrhea and indigestion.