My cat licked a dessert plate clean that had walnut crumble topping on it about an hour ago — is

Short answer

Yes, this is dangerous — walnuts can contain mould toxins that cause tremors and neurological issues in cats, and the shells or pieces can also cause internal blockage. Even licking residue could mean ingesting enough of these toxins or sharp fragments to cause problems. Watch for immediate signs like vomiting or gagging, and be alert for later symptoms such as muscle tremors, weakness, or loss of coordination over the next 12-24 hours. Call your vet or the ASPCA poison line at 888-426-4435 right away for guidance, as prompt action is important with potential walnut toxicity.

Walnuts — Food safety facts

Do not feed · Cats · full breakdown on the linked food page

Risk of mould tremorgenic toxins and blockage; the shell can splinter. Avoid entirely.

Dogs and cats carry the same rating (Do not feed), so the notes below hold for either pet.

Walnuts should not be given to cats at all. Even a small amount can do harm, so there is no portion small enough to be safe.

Do not induce vomiting and do not give milk or oil to “dilute” it. Note the food and roughly how much was eaten, then call your vet or a pet poison hotline and follow their advice on whether to bring the pet in straight away.

Why these cautions matter

Mouldy food can carry tremorgenic mycotoxins, which produce uncontrollable tremors and seizures rather than a simple stomach upset.

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

Open the full food page: Walnuts food facts →

My cat licked a dessert plate clean that had walnut crumble topping on it about an hour ago — is this dangerous?

Walnuts — Food safety facts

Why these cautions matter

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