A Pup Cup from Starbucks is a small cup of whipped cream served in an espresso cup that you can get at Starbucks. It is a popular treat for dogs and is often given to them by their owners when they visit Starbucks. The Pup Cup is generally safe for dogs to eat, as long as they have no medical problems, including no sensitive stomach. However, it is important to keep in mind that every pet is a unique individual, and some pets are more sensitive to lactose, so it is always recommended to start small. The Pup Cup is not an official menu item, but you can ask for it when you order your drink.