Eggshell
CautionEggshell is not poisonous, it is a calcium shard. The AKC warns the sharp edges can injure a dog's throat and internal organs, and raw shell can carry salmonella, so grind it to powder or skip it.
This food guide has not been reviewed by a veterinarian. It summarises general information from sources and should not be used to decide whether a food is suitable for an individual dog or to assess an emergency.
Check before feeding
Check the precautions before sharing
Risk depends on preparation, ingredients or amount. Read the precautions below; body weight alone cannot establish a safe portion.
Signs and health concerns
This list includes both observable signs and conditions identified through examination or testing. It cannot establish the cause or whether an exposure is safe.
- Mouth irritation
- Gagging
- Drooling
- Vomiting
- Diarrhoea
- Abdominal pain
- Salmonella infection
- Fever
More about this food
There is nothing toxic in an eggshell. It is about 95% calcium carbonate, essentially a calcium supplement in a fragile package. The hazard is shape and hygiene, not chemistry. The AKC is explicit that eggshells have sharp edges that can hurt a dog's throat or internal organs. Crushed shell breaks into angular fragments, and since dogs crunch a couple of times and swallow, those fragments travel down the throat and esophagus more or less intact.
The second issue is salmonella. The AKC notes dogs may be exposed to salmonella from raw eggs, with fever, vomiting, diarrhea and lethargy as the result. Contamination sits on the outside of the shell more than in the white, so the realistic exposures are shells tossed to a dog straight off the cutting board, and shells raided out of the kitchen trash. Salmonella is also zoonotic, which puts children and immunocompromised people in the house at risk from a dog shedding it.
The third issue is calcium itself. A single shell holds close to 2 grams of calcium. A dog eating a complete and balanced commercial diet already gets calcium in the right ratio and needs no supplement, and adding calcium on your own to a large-breed puppy can affect skeletal development. If you plan to use shell as a calcium source, set the amount with your veterinarian.
If you do use it, there is only one acceptable preparation: wash the shells, cook them thoroughly by boiling or baking, then grind them in a coffee or spice grinder until they are flour-fine, and stir a small pinch into food. If you can feel grit between your fingers, keep grinding. Never hand over broken shell in pieces.
If your dog already swallowed some, a single small fragment usually passes. Offer fresh water and watch for 24-48 hours. Call your veterinarian right away for gagging, drooling, trouble swallowing, repeated vomiting, a painful belly, black tarry or bloody stool, or no stool at all. Do not induce vomiting at home. Sharp fragments can do more damage coming back up than going down, and getting them out is a veterinary decision. The ASPCA Animal Poison Control Center is at (888) 426-4435 if you cannot reach your vet.
Frequently asked questions
- Can I grind eggshells as a calcium supplement for my dog?
- Yes, if you cook them and grind them to a flour-fine powder first. But a dog on a complete and balanced commercial diet does not need extra calcium, and over-supplementing a large-breed puppy can affect bone development, so set the dose with your vet.
- She ate raw shells out of the trash. What should I watch for?
- Two things: sharp fragments and salmonella. Offer water and watch for 24-48 hours, and call your vet for gagging, drooling, repeated vomiting, abdominal pain, fever or bloody stool. Do not try to make her vomit.
- Are boiled eggshells safe to give whole?
- Boiling removes the salmonella risk but not the sharp edges. Whole or broken pieces can still injure the throat or gut, so grind them to powder and give only a small amount mixed into food.