Dr. Wigfall (DVM, BVM, BVS, BVMedSci) warns that raw bones may carry bacteria such as salmonella, campylobacter and E. coli. While salmonella and E. coli are less likely to affect dogs, they can cause serious infections that require treatment from a vet.
If you wish to offer your dog raw bones, Dr. Murithi (DVM) suggests giving only fresh bones to reduce the chances of bacterial infections.