UPDATE!! We just got home from the vet. She said it was indeed a bite of some sort... His swelling is almost down completely. Still a little left on the right side. Said his eye ulcer is looking good. Instructions are to resume the serum drops, 50mg Benadryl every 12 hrs and lots of love. They also said we need to have the entropion surgery and that would solve our eye problem, so they referred us to a dog eye doctor... Anyone out there know if this surgery really is a cure all?? Insight very welcome!