I have been feeding raw to my two dogs (one 14 mth old female GSD and one 11 yr old male Siberian Husky) for about 3 wks now with great results till recently. I tried giving them a whole, half frozen sardine and neither dog would eat it. My GS finally ate the head and eventually ate the majority of the sardine after I cut it up into large chunks for her. My Siberian wouldn't touch it. Any suggestions on how to get a dog use to eating a whole raw fish?