Comparing a dogs digestive ability to a humans is like comparing apples to oranges. Mother nature has given each species an appropriate digestive capacity.
Dogs, mainly eat meat or at least should only eat meat. A dogs stomach acid (hydrochloric acid) is 15 times greater than in humans so that they digest meat in 10 hours, which accommodates their very short intestines.
Humans produce an equal amount throughout the stomach and intestines combined, allowing raw meat and other raw animal products to digest easily and efficiently in our much longer digestive tract within 16 hours. (It is interesting to note that cooked meat takes 24 -36 hours to digest accompanied with putrefaction.)
The lesson here is that the dog has the ability to digest and assimilate raw meat diets much easier than a human. For this reason they are able to handle bacteria and microbes that might injure a human. It is important to realize that microbes and pathogens are everywhere and that they are needed for the process of dealing with decay.
The message is to feed each species appropriately. Thus the BARF DIET which is the most biologically appropriate raw food for dogs.