Is peanut butter poisonious to dogs?

Peanut butter is not poisonous to dogs, but some peanut butters contain xylitol, which is an artificial sweetener that is toxic to dogs. Xylitol can cause dogs to experience a rapid drop in blood sugar, which can lead to liver failure and death. If you are feeding your dog peanut butter, be sure to check the ingredient list to make sure that it does not contain xylitol.