A dog may eat the occasional potato chip without showing any signs of distress but in general it is not advised to give dogs potato chips. Salt in a dogs diet can cause them to experience excessive thirst and frequent urination. Another danger is potential sodium ion poisoning. Additionally the oil most potato chips are cooked in can cause gastric issues in the dog. For more information on foods that dogs should not eat see: http://pets.webmd.com/dogs/ss/slideshow-foods-your-dog-should-never-eat.