Today my 16mo old puppy, Coco, was about 25 ft away from me and when she turned and saw me, she started barking as if I were a stranger. I've been observing her since. Awhile ago I had her on my lap and she turned her face up to look at me and i noticed that she has a film over her eyes. I checked her sisters (Sweet P) eyes and they are clear. Both puppies are sisters, their Mom is Shitzu/Chihuahua and daddy is 100% Maltese. Mom and Dad are healthy and have no problems with thier eyes. Could this film be affecting her eye sight.. what is this film?