Originally Posted by joshua9578
this is speaking from a human nutrition standpoint but all oil/fish products are dependent on the raising of the animal as well as the size of the fish. sardines are one of the best fish for human to eat because theyre short lived and hence do not accumulate mercury as long as larger species of fish. also wild caught versus farm raised is important for apparent reasons. i would assume this rule of thumb would apply to dogs as well.
Either raw or packed in water. Good for him!