Poor Presto, I hope he heals up quickly! It seems orienteering is rough on your eyes whether you're human, or dog. Glad you at least figured out what was going on!
Thanks! It is good to know that Presto hadn't just randomly decided that he didn't like me anymore, although I am sad that his eye is sore. We went to the vet today and he didn't see any major scratches or debris, so he thinks Presto's original smallish scratch has just managed to get a little infected. I now get to put some antibiotic goo in Presto's eye twice a day for a week and a half. Luckily it wasn't any more serious than that!