UPDATE: why is my dog squinting/closing his eyes? Allergies!

A lot of people were concerned (as well as I for obvious reasons) on my baby, Linkin. They did a green eye stain and found no ulcers and said the backs of his eyes looked good! Hospital said there's a lot of allergies going on around this time and that it's most likely the case! We're getting medicated eye drops to help the irritation right now as I type this. Thanks so much for all the advice!