Today I watched my dog go completely blind. It happened in the span of three days, and this afternoon he has no vision left at all. He is only Six years old, so it has to be disease, especially with the suddeness of it. He has also been drinking large sums of water for about a week now, and he's losing weight pretty quickly. I can't get him into the Vet until Monday, but from what I've read on the web today I'm guessing it's Canine Diabetes.
It's really hard to watch, because it's happened so fast he has no way to adjust yet. Poor guy is running into everything, and I can tell he's quite confused about the whole thing. He's been getting lots of special attention from me in the last few days, and he seems to be lapping that up. He still seems pretty cheerful, though I'm kind of a wreck about it.