hi , I have a gaurded opinion on bones. They can be good and bad. Here's a quote that Sabine mentions in some of her info. Its source is noted at the bottom of the quote.
""Raw bones are the best thing you can provide for your dog's oral health, but some are more
problematic than others.
You can save quite a bit of money by buying bones from your local grocery store or butcher as
well. Turkey and chicken necks, chicken wings and leg quarters, beef, lamb and pork neck bones
or ribs, lamb and veal shanks and oxtails are all suitable options. These are more or less
consumable, depending on how aggressive of a chewer a dog is.
You can also give recreational bones that are not fully consumable, for example beef or sheep
knuckle bones, but please do not give the tube shaped or sliced middle parts, “marrow bones”
that have the knuckles already removed, like those sold at grocery stores:
The fact that these bones are weight bearing affects the texture of the bone, and the older the
source animal is, the longer and heavier the weight compressing the bone matrix. I'm sure you
have heard of this before when learning that broken bones in young humans and animals heal
much faster than in adults, so it's not exaggerated when I'm telling you that these center parts of
marrow bones are the hardest, most durable bones in the body.
Extremely hard bones like that wear down the teeth and can easily cause slab fractures. An
added problem with sliced, “o-shaped” marrow bones is that they can get stuck in the jaw very
easily. There are much better, safer options available, and the joint knuckles of these large bones
are a great example.
Even wild wolves and African wild dogs (two species who hunt and kill large prey animals) were
observed to only chew off the ends of these bones - their teeth guarantee their survival and
broken ones put them at a disadvantage."
 Source: "Raw Meaty Bones Promote Health", Tom Lonsdale, DMV: pp 324 and 325
here's another article that is interesting ...http://www.fda.gov/ForConsumers/Cons.../ucm208365.htm
you will have to be the judge. If you decide to give bones ,strict monitoring is a must .