Answer: some of the time
Pringles are a potato-like chip snack produced by the Procter & Gamble Company*. Potato-like in that they are a mish mash of potato and wheat (not gluten-free obviously). They are uniformly produced, stacked high and sold in cans instead of bags. The original flavor is vegan friendly. Any cheesy flavors include milk ingredients. Sour cream flavor is definitely not vegan. Chips with powdered flavorings may or may not be vegan, some include whey (like the Extreme Dill Pickle flavor).