Kathy Adams had one. A bitch named Madison:
http://www.calaespetresort.com/showdogs.html
I don't think they pop up very often because as a brown breeder it would not be desirable to add a fading allele over your brown color. Brown breeders always try to breed the darkest brown possible.
The flip side is that a light Silver Beige, like Shane, is highly desirable in a silver breeding program because he will bring a good strong silvering allele to the breeding. So Shane could be bred to a Blue or Silver to produce silver puppies. He would probably not be used in a Brown breeding program unless someone was wanting to breed Cafes.
