Dogs can eat eggshells safely if the shells are properly prepared. Eggshells are a natural and beneficial source of calcium and other minerals that support bone health. However, to avoid health risks, eggshells should be thoroughly washed to remove any egg residue, baked at a low temperature to kill bacteria like salmonella, and then ground into a fine powder to prevent choking hazards and make them easier to digest. It is important to use high-quality eggshells from organic or pasture-raised chickens and to consult a veterinarian before adding eggshells regularly to a dog's diet, especially for puppies, pregnant dogs, or dogs with certain health conditions like high calcium levels or bladder stones.