Why?
Mussel meat provides protein and minerals and isn't toxic to cats. The problem is how it's usually served: steamed in wine with garlic, shallots and butter, or in a creamy sauce. Raw mussels can carry bacteria, viruses or algae toxins. And the shells are sharp and a choking hazard.
How much?
One or two mussels cooked separately in plain water, with no salt or aromatics, out of the shell, now and then. Don't share the broth from seasoned mussels.
The risks
- Garlic, shallots and wine in classic mussel recipes
- Raw mussels: bacteria, viruses, algae toxins
- Sharp shells: choking and injuries
- Canned or sauced mussels: salt and fat
- Seafood intolerance: vomiting
Your cat ate some: what now?
One or two plain mussels are no problem. If your cat ate mussels cooked with garlic or shallots, or lapped up the broth, watch closely for several days, since the effects can be delayed, and call your vet for vomiting, diarrhea, weakness, pale gums or refusing food. If they ate a good amount, call right away.
Better options
A cooked, peeled shrimp or a bit of plain cooked fish is easier to prepare for your cat.
Common questions
Can cats eat green-lipped mussels?
Green-lipped mussel is used in some joint supplements for pets. That's different from sharing seafood from your plate: ask your vet before starting any supplement.
Can cats eat clams or oysters?
Not raw, since raw shellfish can carry bacteria and viruses. A small piece of plain cooked clam is unlikely to cause harm, but shellfish aren't an ideal treat for cats.
This information is general and does not replace advice from a veterinarian. If your cat has swallowed something toxic, call your vet or an animal poison control center right away, without waiting for symptoms.