did you use ivermectin? Ivermectin overdose causes sudden blindness, I have had two it happened to at the same time. have photo's and video. if your dog ate the horse poop or chewed or licked the syringes its very likely its an ivermectin od. ivermectin is safe in most breeds of dogs but in a very low dose, paste wormer or whats been passed with the manure is to much for a dog. it can be fatal but odds are its not. my dogs recovered in a few days, but that was after I spent thousands at the doggy eye doc and the specialist in Lynnwood. if you went to the eye vet in redmond, they have my dogs file there. you can pm me and I will give you the info for them to look up, they ran all sorts of tests but could not help her. the specialist were stumped too, I found the ivermec they got in to 3 days into the ordeal.
You nailed it!
Simon loves to share the horse grain, and our filly spit out the Ivermectin onto her food. Simon must have gotten enough to affect his vision. The timing certainly matched. We went to Northwest eye specialist yesterday at least armed with a possible explanation and she agreed. He was already getting some of his vision back in his left eye while we were there and she expects him to fully recover over the next few day.
Today he is seeing well enough to get around the house and go with me up to the barn to help feed.
Thank you for the heads up. We are all doing so much better.