I give my hounds sardines every week. Good for the coat etc etc. I know you all do too. Ruby had a habit of being unwell periodically, not eating and just not right. Didn't last long, by next day she was fine again. Started to mark it down on the calandar and would you believe it's the sardines! Didn't give them any for the last 2 1/2 weeks now and she's been fine. Rosie and Lenny love sardines so am now going to try her on white fish. You know the frozen blocks you get from pet shops. Maybe it's fish in general but maybe sardines just too oily. Anyone else ever had this problem? She does eat sensitive bakers as she can't eat regular food but everything else agrees with her.......especially pigs ears!!!!