If the prey is small, cats will eat the bones whole. Of course, most cats (and dogs) don't chew... they simply gulp their food down.
Bones themselves are rich in minerals, primarily calcium and phosphorus. If they can be digested, of course. Don't forget the marrow inside the bones, which is highly nutritious - a great source of protein, fat, vitamins, lecithin, and methionine.
If your dragon gnaws on the bones they'll get the 'natural dentistry' effect which naturally 'brush' and 'floss' the teeth and massage the gums. Though eating bones has a risk of broken teeth, fragments lodged in the mouth, intestinal obstruction, and perforation.
I've always envisioned a dragon as chomping off parts and swallowing them whole. Somehow picturing a dragon sitting there gnawing on a human thigh like I would a chicken wing just doesn't seem right.
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