
If you do a search for chicken wings or bones on here you will find loads of threads about it.
I have fed raw bones to my dog since he was 8 months old, including chicken wings, lamb ribs, pigs trotters, chicken carcasses, necks, quarters etc. There is a lot of conflicting evidence about but in the end you have to make up your own mind. I have a Golden Retriever who sometimes eats them whole and other times will gnaw them a bit before swallowing them. My vet does not agree with raw feeding but I, myself, am happy with my decision to feed raw. Bones should only ever be fed raw - never feed cooked bones as they will splinter.
Marrow bones are great for all ages and sizes - the marrow is very rich so you may want to scoop some out to begin with until your dog is used to the marrow or he may end up with a dire rear :D
My dog does not guard his food and will happily exchange it for something of greater value if the need arises and I can't see any reason why a bone would be guarded any more than any other source of food.
Try googling BritBarf and you will find answers to your questions :)