No water chestnuts are NOT toxic to dogs. It may have just upset his tummy. read more
When raw, Water Chestnuts are dangerous due to Fasciolopsiasis that can be found on the surface of the plant and therefore get into the product. When cooked, Water Chestnuts are fine. They act as ruffage and do not digest at all, therefore, chopped up or minced is better than sliced disks (as found in most cans). read more
According to The Daily Puppy, the bark, leaves and nuts of the horse chestnut tree are poisonous to dogs when ingested. The nuts from the tree not only contain toxins, such as saponin, aescin and glycoside, but can also cause choking in dogs. read more