§ Toxic plants · Juglandaceae · Checked Oct 2026
Is eastern black walnut toxic to cats and dogs?
Yes. Eastern black walnut (Juglans nigra) is toxic to cats and dogs, according to the ASPCA Animal Poison Control Center. Plant Smart rates its effects Severe, level 3 of 4.
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§ 010 · Signs
What to watch for
Signs include tremors, seizures and wobbliness or poor coordination. Signs can start within hours; some take a day or more to show.
§ 020 · If it happened
What to do if your pet ate it
Call your vet or a pet poison hotline straight away, even if your pet seems fine: the ASPCA Animal Poison Control Center, (888) 426-4435, or Pet Poison Helpline, (855) 764-7661. Both are open 24 hours and charge a fee. Have the plant or a photo of it to hand, and don’t make your pet vomit unless a vet tells you to.
§ 030 · Same family
Other Juglandaceae plants toxic to pets
Eastern black walnut belongs to the Juglandaceae family. ASPCA lists these relatives too.
§ 040 · Questions
Questions about eastern black walnut and pets
Is eastern black walnut toxic to cats?
Yes. ASPCA lists eastern black walnut as toxic to cats.
Is eastern black walnut toxic to dogs?
Yes. ASPCA lists eastern black walnut as toxic to dogs.
What happens if my pet eats eastern black walnut?
Signs include tremors, seizures and wobbliness or poor coordination. Plant Smart rates it Severe, level 3 of 4.
What should I do if my pet ate it?
Call your vet or a pet poison hotline right away, even before signs appear: the ASPCA Animal Poison Control Center at (888) 426-4435, or Pet Poison Helpline at (855) 764-7661. Both charge a fee. Have the plant, or a photo of it, to hand.