Vegas's eyes used to run due to bad food, now they run due to seasonal allergies. When they are extra runny I give him 1 25mg. of benadryl to help him plus he gets an allergy shot every 5 weeks during this season. Our pollen is out of controll and I myself am taking antihistamine for my runny eyes. What food are you feeding? I am sure you have mentioned it, but it does contribute to the runny eyes. About blowing his nose??...I don't know how to "get them" to blow their nose, Vegas does a great job on his own...ON ME!!!!