If you are a dog owner, you know that your dog is completely sweet and pure of heart and would never manipulate you for a treat. No. This article is about other people's dogs; according to a recent study done by the University of Portsmouth, there's a strategy behind those puppy-dog eyes. Essentially, dogs know how to make their eyes look larger, making them look even more adorable, and they know that this gets our attention. We're powerless to their cuteness, and we hand over the treats. Everyone knows that dogs are good at begging, but who knew that they were doing it on purpose to mess with our heads?