Our two year old bulldog has a slightly drooping eyelid. The eye is not red, irritated or producing any abnormal mucas. Gus has never had any eye problems before, but he does have allergies. Generally, his allergies just causes some some licking in between his toes, which we treat with benadryl, but, could his allergies also cause his drooping eye? He does not try to itch or rub the eye. We are just being cautious - any suggestions?