Can Cats Eat Nori / Seaweed?
Why it’s a sometimes-food
Plain, unsalted nori is not toxic and provides minerals, but seaweed is rich in iodine, and excess iodine can aggravate thyroid problems — a real concern because hyperthyroidism is common in older cats. Snack-pack seaweed adds salt and often garlic or sesame oil.
How to serve it safely
Offer a fingernail-sized piece of plain dried nori rarely; never share seasoned seaweed snack packs.
Warning signs to watch for
Too much seaweed can cause vomiting or diarrhea; seasoned versions add salt toxicity and garlic risk on top.
When to call the vet
Call your vet if a cat eats a large quantity of seaweed snacks, especially ones listing garlic powder.
Common questions
Is spirulina or kelp supplement safe?
Only in doses designed for pets. Human doses of kelp can deliver too much iodine for a cat’s thyroid.
More foods for cats
This page is general educational information, not a substitute for professional veterinary advice. Every pet is different — if your animal ate something concerning, contact your veterinarian or a pet poison hotline right away.