Haven't tried raw chicken wings - do you get them from the supermarket or pet shop and do you remove the bones first or is it purely the wing itself?
We get them from either Morrison's or Sainsbury's (not Waitrose as the ones they sell have the bony bit at the end removed before they go on sale

) They sell them in boxes of 8-10 or so and we freeze them in individual bags so we can defrost them as and when we want, we also cut the wings off any chickens we buy for our dinner so Morgan can have them.
He gets them whole, the idea is that he gets some bone in his diet, not just the fresh, raw meat.