Can water chestnuts make a dog sick?

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).

At the end of the day, I'd recommend to just stay away from them. If you want to give your dog ruffage, give them carrots. Our 2 Yorkies and 2 Maltese like carrots as treats.

Do not ever let your dog eat horse chestnuts (these are the ones that grow inside of a pod that looks similar to an orange... not the ones that grow in a small pod with spikes on the outside (roasting chestnuts). Horse chestnuts are straight up poisonous. They cause a drastic reduction in red blood cells. I do not know whether roasting chestnuts are bad for dogs.