You're quite right BobL, slivers of hard, dry bone can get lodged in a cat's intestines and cause a very bad injury. but ours are elderly now, and don't actually eat the harder bits of bone. They just nibble off any meat left, and crunch the softer joints. Then they lick out the dish. It hardly needs washing after they've finished.

Dave, I hesitate to confess this, but I adore raw lambs' kidneys and lamb's liver. I chop it up and it's delicious. Much prefer them like that than cooked!