Thanks for you useful informations about the booksand the big bones , I also study and try to collect all documentaries concerning wolves and hybrids.

Your information about the barf-fed dogs died from big leg bones is already self-explained. I also do not feed my big dogs with big leg bones (such as cow or lamb) but only for puppies younger than 8-9 months just for their chewing pleasure , teeth- cleaning ,and jaw exercise....after maels. 

Big bones are dangerous for big dogs because they have very strong jaws and teeth-sets(molars) which can break the hardest bones  , just enough size for them to swallow through their big throat , but still too large to go through their digestive systems and cause serious pierced intestines. 

This also depends on the individual eating-habit of each dog. Some of my big dogs would just have their good times enjoy chewing and licking  aroung without breaking or swollowing . I give them sawn leg bones(about 3"- 4" in length) , so that they can lick the bone marrow from the inside.

BARF feeders must be well aware of the fact  that way of BARF we feed our pets can never be a whole-natural condition . The best way is trying to get most useful informations as possible to ensure the safty of what we feed to our beloved pets. This is one of the best infos. for us ...BARF feeders . Hope to hear more from you on this topic.

Thanks again for the information about the books and website of Dr. Micheal W. Fox.