Raw meat that has been left out in the open for a while will develop nasty bacteria, making it unfit for doggy consumption. Eating old raw meat can infect dogs with parasites and put them at risk of Botulism, a dangerous disease that attacks the dogs' nervous systems.Raw meat that was handled with unwashed hands can also contract all kinds of bacteria. The best way to make sure the meat is free from any pathogens is to cook it properly.