Ground bone they should have no problems with, they only thing to watch for is if you are feeding whole bones:
From In The Raw Petfood
*Puppies, kittens, seniors and beginners choose softer bones like backs,
and necks. They are a softer cartilage & bone mix and are padded with
meat all around so they are easily digested.
Avoid biting when a simple growl will do
The Spirit Lives As Long As Someone Who Lives Remembers You - Navaho Saying
Vindication ~ For all those pets who became sick or lost their lives from tainted pet food