My dog - a little chihuahua girl got hurt in the eye - perhaps while playing and so it became red, watery and hard to keep open.
I then diluted organic Apple Cider Vinegar - 2 tablespoons in 10 tablespoon full of water. Soaked a organic cotton ball and then squeezed the water in the eye and kept the soaked cotton over the eye for few mins. I did this evey 1/2 hr and then before bed I put organic cold-pressed castor oil in the eye. This was to prevent the eye from sticking and to provide long term eye lubrication throughout the night.
The next day her eye was almost normal. SO I continued the regimen but every 2 hrs or so. And then castor oil at night. The 3rd day it was back to normal and she was once again a normal, happy, jumpy dog! Proud to say, 'no we didn't use any antibiotics!!'