The most common eye problem among puppies is a condition called pug puppy eye. When the dog is just two months old, he or she will open its eyes for the first time. After their eyes open, the eyelid folds over the eye to protect it from injury. At that point, the eyelids start to sag and droop and eventually come off of the eyes completely. This causes irritation and pain to the dog’s eye, which leads to them squinting and rubbing their eyes frequently.