I feed the ones in tomato sauce, but I don't give them the "extra" sauce, just whatever clings to the fish, and I split the can between three dogs, so I don't think they are getting enough to hurt them. Even Fletcher, who is sensitive to just about anything plant based, can tolerate that much. I aim for a can a week, added to regular meals. None of them like raw fish, and Fletcher doesn't tolerate any kind of fish oil, so this is about my only option.