I have a blind dog & she doesn`t growl when out for a walk or at home, tho she went blind slowly, did you dog go blind over time or straighway. That may have something to do with the growling. I stopped taking mine out for walks as she became more unsure of herself outside & stopped enjoying them, but I`m lucky as I have a large garden :)
The best I can suggest is try taking her where she won`t come across strange dogs, you be on the lookout for any & if you see any change direction. I don`t put my blind dog in any situation for her to become frightened, not easy tho I know! you could also join the group below for advice :)
http://groups.yahoo.com/group/blinddogs/Christine, Spain.