Are mussels safer or more dangerous for dogs compared to clams or oysters?

Mussels, clams, and oysters are all similarly safe for dogs when prepared correctly. The key is that they must be thoroughly cooked (never raw, due to bacteria) and completely removed from the shell to prevent choking or gut injury. All shellfish should only be given in very small amounts as an occasional treat. There's no significant safety difference between the types; the risk lies in the preparation. Offer a tiny piece of plain, cooked mussel meat and watch for any stomach upset.