Buckeyes contain aesculin and related glycosides in the seeds, leaves, bark, and young shoots. Even a small amount of chewed seed may cause vomiting, drooling, diarrhea, weakness, or neurologic signs. Contact a veterinarian or poison service immediately if ingestion is suspected.
Buckeye trees (Aesculus spp.) are ornamental shade trees that produce spiky green husks splitting open in fall to release glossy brown seeds. The smooth seeds are also called conkers.
Buckeyes grow near sidewalks, driveways, and shared green spaces; fallen seeds roll onto patios and into dog runs. People collect seeds for crafts and fall decor, leaving them on porches, entry tables, and shelves.
Exposure is most common after storms, mowing, or pruning when debris scatters at ground level. Husks and seeds may end up in leaf piles, compost edges, or open waste bins. The glossy seeds are toy-like and may encourage mouthing.
