Small amounts of plain, fully cooked, de-shelled crayfish are safe. Skip Cajun-style seasoning — the garlic powder and onion powder used in crawfish boils are toxic in enough quantity, and boil salt levels add up fast.
Crayfish, also called crawfish or crawdads, are small freshwater crustaceans sold live, frozen, or pre-cooked and peeled. In the US South they are best known from crawfish boils, where whole crayfish are steamed with heavy seasoning blends.
Restaurant and backyard boils season the cooking water with cayenne, Old Bay, garlic, and onion, plus corn, potatoes, and sausage cooked in the same pot. Every one of those add-ins is a reason to keep pets away from the boil itself and offer only plain tail meat instead.
Raw or undercooked crayfish can carry bacteria and lung flukes, so meat needs to be fully cooked and shelled before a pet gets any.
