Why?
Peanuts are legumes rather than true nuts, but they're just as fatty: in larger amounts, that fat causes vomiting and diarrhea and may contribute to pancreatitis. Snack peanuts are also salted, and some are coated or flavored with garlic or onion. They're small and hard enough to be a choking hazard, and poorly stored peanuts can carry toxic molds called aflatoxins.
How much?
Skip them, even plain and unsalted: they add nothing for your cat. Keep snack bowls out of reach.
The risks
- Vomiting, diarrhea
- Possible pancreatitis after a large amount
- Too much salt: intense thirst, stomach upset
- Choking or blockage from a whole peanut or shell
- Coatings with garlic, onion or chocolate
Your cat ate some: what now?
One or two peanuts usually aren't serious: watch for vomiting, diarrhea and lethargy over 24 to 48 hours. Call your vet if your cat ate a good amount, is coughing or struggling to breathe, or if the peanuts were chocolate-covered or garlic-flavored.
Better options
At snack time, keep some cat treats handy for your cat. A small piece of plain cooked chicken goes over well too.
Common questions
Can cats eat unsalted peanuts?
They're less of a problem than salted ones, but still very fatty and hard to digest. A peanut dropped on the floor isn't a big deal; it just isn't a treat to offer.
Can cats eat peanut shells?
No. Shells are hard to digest, can cause choking or a blockage, and are more likely to carry mold. Keep them out of reach and toss them right away.
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.