Well I tried it tonight, I put a carcass (without the leg bones) in the steaming basket with some carrots, celery, bay leaves & peppercorns and made a stock first, Then I chopped up the carcass into chunks & minced it on speed 9 for a few seconds & it worked! So for anyone interested in making their own dog food with chicken bones it can be done in the thermomix....of course!