Go to this group site, many of us who have dogs with this horrible disease have hope based upon a treatment out of Boston. My dog Gidget was diagnosed with a form of this in September. They thought she would only live a week or so as she went blind and couldn't walk. She is on treatment now and it has been 3 months, she has gained most of her sight back and she is holding her own. She still has a long way to go but this disease can be put into remission. The treatment has up to a 90% success rate, the sooner you catch it and start the treatment the better. Here is the link
NewGMEDogs : NewGMEDogs
Hope you explore this treatment and prayers are being sent your way.
Lee Ann