this may have been discussed, but I don't usually see anyone mentioning adding fish to the doggie diet. Is it ok? I ask because I notice Ham really perking up when I open a can of tuna, and he usually doesn't care at all what I'm eating. My hubby goes into overdrive buying me tuna and salmon, and so I have a zillion cans to share. I'm wondering about mercury content (I know, even tho I live on the stuff) I also have some boneless whitefish that I thought they might like....but I'll be waiting til I hear if it's ok or not. IF the whitefish is ok...should I cook or feed raw? THANKS!!