A bazillion years ago when I fed raw, I was told it was not okay to feed RMBs with kibble, but it was okay to feed muscle meats and organs with kibble. I would assume the bone is the issue, the part that digests at a different rate? I don't remember exactly. Not too helpful.
CARLY ......... Ch. Lauremi's No Reservations (AKC GCh pointed, HIC)
SCARLET ..... Lauremi's Almost Wasn't (AKC pointed) and absent friends... SAGE ~ Lauremi's Whim Z v Jakmar ~ AKC major ptd, HIC ~ 2010-2015