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Can Cats Eat Walnuts?

🚫 Not Recommended
✅ Cross-checked against veterinary poison-control guidance · Oct 2026 audit
⚠️ Educational info only. If your pet just ate something and looks unwell, skip the reading and call your vet or Pet Poison Helpline (US): (855) 764-7661.
No. Walnuts carry mold-toxin risks and too much fat — keep them away from cats.

Why it’s a problem

Walnuts are prone to tremorgenic mycotoxins from molds that grow on them, and moldy walnuts have caused tremors and seizures in pets. Even clean walnuts are extremely fatty, and their size and ridged texture make them a choking and tooth-risk item for a small cat.

How to serve it safely

Keep walnuts, walnut shells and baked goods containing them out of reach, and discard fallen nuts from trees where cats roam.

Warning signs to watch for

Tremors, wobbliness, vomiting, fever and seizures, sometimes hours after eating moldy walnuts; even clean walnuts can cause stomach upset.

When to call the vet

See a vet promptly if a cat eats walnuts and develops tremors or seems unsteady — mold toxin cases need fast treatment.

Common questions

Is black walnut worse?

Black walnuts are especially prone to dangerous molds. Treat every walnut variety as off-limits for cats.

More foods for cats

Salmon✅ SafeYes, when fully cooked and unseasoned. Salmon is a nutritious fish most cats enjoy.Tuna⚠️ In ModerationOccasional small amounts only — tuna should be a treat, never a meal.Cow’s Milk🚫 Not RecommendedBetter to skip it. Most adult cats are lactose intolerant and milk gives them stomach upset.Garlic☠️ ToxicNo. Garlic is poisonous to cats — even more potent per gram than onion.Cooked Eggs✅ SafeYes, fully cooked and plain. Eggs are a protein-rich treat cats usually enjoy.Cheese⚠️ In ModerationSmall bites are usually fine, but many cats cannot digest dairy well.

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.