What happens is their eyes stop producing their own tears, and the eyes dry out
and become very itchy
and irritated. As a result, the skin around the eyes becomes red
and inflamed looking, and it COULD have something to do with the redness and hair loss around the mouth as well, since these dogs have such short faces, the itchy eyes cause them to rub their faces on carpets, rough-textured furniture, etc., to seek relief from the itching.