Another vote for eating the bones.
Most things which can eat bones, do. Reptiles and ampbhibians certainly do, with the possible exception of scavengers which may be dealing with prey too large to swallow. Birds swallow prey bones and all, except for owls who cough up the indigestible parts (apparently their digestive systems don't work as well as those of other birds). Mammals that eat prey small enough to swallow, or bite apart and swallow, eat it bones and all. Rodents eat any bones they can find; that's why you so rarely find shed antlers in the forest. Calcium and the other bone-forming minerals are a valuable resource. In general, gnawing prey off bones is limited to some primates, some fish, and some of the big cats, as far as I know, and except for the primates, the one thing they all have in common is eating prey larger than themselves. That's unlikely to be the case with your dragon.
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