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If your cat ate black walnut 'thomas' — 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.

Black Walnut 'Thomas' is toxic to cats (ASPCA).

Pet emergency

My cat ate Black Walnut 'Thomas' — what to do

Step by step

  1. Take black walnut 'thomas' 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 black walnut 'thomas' — FAQ

Is black walnut 'thomas' poisonous to cats?

Yes — the ASPCA lists Black Walnut 'Thomas' (Juglans nigra 'Thomas') as toxic to cats. Black walnut (Juglans nigra) is listed by the ASPCA as toxic. Moldy nuts and hulls can produce tremorgenic mycotoxins such as penitrem A, causing tremors, seizures and incoordination in dogs; the roots, bark, wood, pollen and nuts are highly toxic to horses, triggering laminitis and colic, and even wood shavings are dangerous. Keep pets and horses away from fallen nuts, hulls and walnut bedding.

How serious is it if my cat ate black walnut 'thomas'?

Black Walnut 'Thomas' 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. Black walnut (Juglans nigra) is listed by the ASPCA as toxic. Moldy nuts and hulls can produce tremorgenic mycotoxins such as penitrem A, causing tremors, seizures and incoordination in dogs; the roots, bark, wood, pollen and nuts are highly toxic to horses, triggering laminitis and colic, and even wood shavings are dangerous. Keep pets and horses away from fallen nuts, hulls and walnut bedding. 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 black walnut 'thomas' well out of reach, or swap it for an ASPCA non-toxic plant — see the best cats-safe plants list.

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