Is Black Locust Toxic to Dogs?
Also known as: False Acacia, Robinia pseudoacacia · Robinia pseudoacacia
What makes it toxic
Robin, a ricin-like lectin concentrated in bark, seeds and young foliage. It binds cells in the digestive tract and disrupts protein synthesis — toxic, though far weaker than ricin.
Warning signs to watch for
Drooling, vomiting, diarrhea and abdominal pain starting within hours; larger meals can add depression, weakness, stumbling and rarely seizures or collapse.
What to do if your dog eats it
Take the material away, rinse the mouth and call your vet, describing the part chewed. Neurologic signs or collapse after bark or pod chewing require immediate treatment.
Common questions
My dog stripped bark off a black locust sapling — is that worse than leaves?
Yes — young bark and shoots are the most concentrated part. Contact the vet promptly and watch for hours, not just minutes, because toxalbumin effects build.
Are honey locust and black locust equally toxic?
No — honey locust is much milder and its pods are often nibbled by wildlife. Black locust (Robinia) is the genuinely poisonous one.
More plants checked for dogs
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. Checking what your pet can eat? Visit our sister site SafeOrToxic.