I've always been told not to let dogs eat cooked chicken bones since they can easily splinter/fracture and cause problems for the dog but I've never seen any satisfactory evidence of this and I am afraid that I am denying my dog some tasty snacks based only on superstition and hearsay.
I have a German Shepherd myself and, besides all the feathers, I can't imagine her having much trouble eating a raw chicken in the wild if she were hungry and managed to catch one. She also regularly splinters beef/pork rib bones and other similar prepared treats.
The best answer I can find on the internet among anecdotal evidence, arguments from authority and other noise is that the difference between raw and cooked chicken bones is what presents the major problem.
I am certain there are stories of dogs choking on cooked chicken bones just like there are stories of dogs choking on other bones, tennis balls and treats they commonly chew on. What I am really interested in knowing is if the rumors of digestive problems such as intestinal perforation have any evidence behind them.