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My dog with a sensitive stomach ate three cooked mussels and now has loose stools — could the mussels be the cause?

Dogs · Food safety

Last reviewed: 2026-09-05 · Reference ranges: ASPCA, Pet Poison Helpline & Merck Veterinary Manual

Short answer

Yes, mussels could easily cause loose stools in a dog with a sensitive stomach. While cooked mussels are safe in small amounts, they are a rich, novel protein that some dogs don't digest well. The result is often temporary diarrhoea or gas. Withhold food for 12 hours, offer plain water, and then a bland diet like boiled chicken and rice. If the diarrhoea persists beyond 24 hours or your dog seems lethargic, contact your vet to rule out other issues.

Mussels — Food safety facts

Safe to share · Dogs · full breakdown on the linked food page

Cooked and removed from the shell, in small amounts. Raw shellfish carries bacteria.

Dogs and cats carry the same rating (Safe to share), so the notes below hold for either pet.

Mussels is not toxic to dogs. The real limit is calories, fat and salt, so treat it as a small extra alongside the normal ration rather than a meal in itself.

There is no poisoning risk here, and the usual problem is simply eating too much at once: a heavy fat or salt load can bring on loose stools or a single vomit. Offer water, keep an eye on the pet for 24 hours, and do not induce vomiting.

Why these cautions matter

Raw animal protein carries Salmonella and E. coli risk, and those bacteria can spread to the people in the household too.

The full verdict, portion guidance and serving notes are collected on the Mussels food facts page.

Open the full food page: Mussels food facts →