An occasional nibble or two of a fast-food french fry should not pose a serious hazard for a healthy dog. However, it is important to keep in mind that any food not part of your pet's normal dietespecially if it’s high in fat or saltcan cause gastrointestinal upset. The consumption of large amounts of fatty or spicy foods may also lead to pancreatitis, a serious inflammatory condition of the pancreas.
The bottom line? If you decide to give your furry friend “a break today” and offer him a french-fried treat, do so only on occasionand in small amounts.