Can dogs eat eggshells?

Complete dog foods are formulated with a balanced ratio of calcium and phosphorus. Adding calcium on top can upset that balance. Large and giant breed puppies are particularly sensitive: excess calcium during growth has been linked to skeletal problems, and some puppy foods are designed specifically to limit it.

Homemade diets, on the other hand, often need a calcium source, but the amount should come from a vet or nutritionist.

Large pieces of raw shell can be sharp and may scratch the mouth or throat. Raw shells can also carry Salmonella on their surface. If your dog regularly steals shells from the compost or recycling, keep those containers closed.

Shells are not digested well in big pieces, so they often pass through looking much the same.

Some owners who cook for their dogs use ground eggshell as a calcium source under veterinary guidance. Shells are rinsed, baked at a low temperature to dry and sanitize them, and ground to a fine powder in a clean coffee grinder. Your vet will tell you how much, based on your dog's weight and the rest of the diet.

Never guess the amount, especially for a growing puppy.

Cardboard egg boxes are often used as chew toys. Shredding them is usually harmless, but dogs that swallow large amounts of cardboard can develop a blockage. Supervise and take the box away if your dog starts eating rather than tearing it.