Actually chef most breeds of dogs were derived from wolves. And yes the AKC has recognized wolves as a breed of dog. German shepherds, and most large breed dogs have problems in senior years if calcium is not augmented.
I understand that birds breed specifically for meat, are a better option when only using the birds for meat. But there is no sense of wasting a layer when it reaches that point that it is not worth the feed for the reduced laying over time. In that case I and others have no problems processing those birds for the table. But then they are used as most would use game meat. We use our pressure cooker a lot. Squirrel got cooked in it last night meat falling off of the bone. I have cooked some of the toughest cuts of beef, and buffalo and had it so tender it can be cut with a fork. Nothing gets wasted including the bones. I was just suggesting that a old bird does not have to be a tough bird if cooked right.