In addition, some deep-sea fish have high vitamin A content, which may also lead to vitamin A poisoning in dogs. From this point of view, seafood seems to be not suitable for dogs as a whole.
But in fact, fish products have been used from protein in many foreign feeds, but they are not widely used because of their high cost and complicated processing. Moreover, in China, due to the deep-rooted existing concepts mentioned above, the overall acceptance will be poor.
Of course, the food intake is still based on the principle of health, just moderate, but not excessive. The simple rule is not to eat anything but feed. In the central idea of dogs, the three most important things are eating, playing and mating. It is not a good thing to deprive him of the pleasure of eating.
If you are not sure what you can eat, ask your family veterinarian or a professional feed nutrition veterinarian. I believe they will give you a satisfactory answer.