Meibomian Cyst On Puppy. The third eye (aka nictitating membrane) is the tissue you see in the corner of the eye. Somehow, this condition is compared with stye.
But the two are much different from each other. Redness, swelling, pawing at the area, crusting of the eyelids and fur loss around the eyes could be signs of trouble. Its usual size is about 2 to 8 mm.