I decided to try some vinegar on my English Cocker Spaniel. He has a horrible problem with Conjuctivitis. He is always rubbing and scratching his eyes and they matter and he always has crusty stuff on his eyes. I didn't have any ACV so I used Balsamic Vinegar on a cotton ball on the back of his neck, right by his collar and also rubbed a little on the top of his front paws. In one day, his eyes cleared up! They aren't red anymore and I haven't seen him scratch his eyes once! Who would think that vinegar could have such a healing quality on my dogs eyes?!