Basically, my guinea pigs left eye won't open all the way. It can and he does when running around, but just chilling there his right is open all the way and his left is half closed. He doesn't seen to be scratching or messing with it and his behavior hasn't changed but it is almost always almost closed. I only just noticed so it is a new thing but as I look at him I see him closing it almost completely and opening it half way again repeatedly as his right stays open. Could he maybe just have a cold in his eye? It doesn't seem serious but with guinea pigs you never know, not to mention I am going to be flying with him in little over a week so I want to make sure he is okay for flight. I'll try to post pictures later.