I feed raw to several of my babies and MOST of the time they love it, but ONLY when it's completely thawed, as others have said. Otherwise they won't touch it. Some days they turn their nose up and I have to put a few bites of cheese or a spoonful of yogurt on the plate with the raw and then they eat it all. Mine don't care for the regular chicken flavor or the duck. Organic chicken is their favorite, followed by beef, and finally lamb. I cut it up into tiny pieces and it's much easier for them to eat. If you have to have something heated for him to be enticed I suggest cooking a little chicken or some hambuger meat and putting a few tiny pieces in between the raw. He'll go for the hamburger or chicken first because it's cooked and smells better, and then he'll realize he's hungry and keeping on eating the rest of what's on the plate, which includes the raw. After a few days he should eat just the raw by itself. Yorkies are so picky, aren't they?
