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If your cat ate english walnut 'hartley' — do this now

  1. Take the plant away and clear any pieces from their mouth.
  2. Do not induce vomiting unless told to by a professional.
  3. Call your vet or the ASPCA Animal Poison Control Center on (888) 426-4435 now.

English Walnut 'Hartley' is toxic to cats (ASPCA).

Pet emergency

My cat ate English Walnut 'Hartley' — what to do

Step by step

  1. Take english walnut 'hartley' away and remove any plant material from your cat's mouth so they cannot eat more.
  2. Note roughly how much was eaten and when — this helps the vet judge the risk.
  3. Do NOT induce vomiting unless a vet or poison-control specialist tells you to.
  4. Call your vet or the ASPCA Animal Poison Control Center on (888) 426-4435 (a consultation fee may apply) and follow their advice.
  5. Watch for drooling, pawing at the mouth, vomiting, loss of appetite, or lethargy, and bring a leaf or photo to the appointment.

This is general guidance, not veterinary advice. Pets vary, and a reaction may be to soil, fertiliser, or pesticide as well as the plant. When in doubt, call your vet or the ASPCA Animal Poison Control Center on (888) 426-4435.

My cat ate english walnut 'hartley' — FAQ

Is english walnut 'hartley' poisonous to cats?

Yes — the ASPCA lists English Walnut 'Hartley' (Juglans regia 'Hartley') as toxic to cats. The ASPCA lists Black Walnut (Juglans nigra), the same genus, as toxic to dogs and horses (non-toxic to cats); horses develop laminitis and colic, and moldy nuts and hulls cause tremors and seizures in dogs. English walnut shares juglone in all parts, and fallen nuts readily grow Penicillium mould producing tremorgenic mycotoxins (Penitrem A) that cause vomiting, tremors and seizures in dogs. Treat as toxic, keep dropped nuts and hulls away from pets and horses, and seek veterinary care on ingestion.

How serious is it if my cat ate english walnut 'hartley'?

English Walnut 'Hartley' is toxic to cats and reactions can be significant, so treat any ingestion as urgent. Call your vet or poison control on (888) 426-4435 straight away rather than waiting to see if symptoms develop.

What symptoms should I watch for?

Signs usually appear soon after chewing: drooling, pawing at the mouth, vomiting, loss of appetite, or unusual lethargy. The ASPCA lists Black Walnut (Juglans nigra), the same genus, as toxic to dogs and horses (non-toxic to cats); horses develop laminitis and colic, and moldy nuts and hulls cause tremors and seizures in dogs. English walnut shares juglone in all parts, and fallen nuts readily grow Penicillium mould producing tremorgenic mycotoxins (Penitrem A) that cause vomiting, tremors and seizures in dogs. Treat as toxic, keep dropped nuts and hulls away from pets and horses, and seek veterinary care on ingestion. Any worsening or persistent symptoms warrant an immediate vet visit.

Should I make my cat vomit?

No — do not induce vomiting unless a vet or the ASPCA Animal Poison Control Center specifically tells you to. The wrong action can make things worse. Call (888) 426-4435 and follow professional advice.

How do I stop this happening again?

Keep english walnut 'hartley' well out of reach, or swap it for an ASPCA non-toxic plant — see the best cats-safe plants list.

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