Yes, guide dogs for the blind. Sorry, but I've gotta go on my tangent now!
Smooth Collies have been used as "seeing eye dogs" successfully for many, many years. The first Collie guide dog was "Prince" who graduated from Leader Dogs for the Blind in 1949 . My mother worked with Dr Lee Ford's "Collie Companions for the Blind" program in the 1950s, helping with research, as she herself was only a teenager at the time.
I donated the first Smooth Collie to graduate from Southeastern Guide Dogs (Florida) in 1989 - he was my personal dog and I was only 18 yrs old. It was a huge thing for me, and still makes me tear up to think what my boy Lancer was able to do for a lovely woman who lost her sight to diabetes. WIth Lancer's help, she was able to go back to college and finish her degree.
Our bloodline was the foundation of the breeding program used at Southeastern Guide Dogs in FL from 1989 to the mid 2000s, and my mother and I were consultants for the program throughout that time, but there was a change in management and they slowly phased the Collies out, and the people who supported their use as well. Prior to that, they were their #2 breed at that school, with a close to 90% pass rate. A few independent schools use them too, and they are becoming a new up and coming breed for the Guide Dog Foundation for the Blind in NJ (where Dora was donated) thanks to my mom and a few folks who had dogs from our bloodline.
Sorry for the gushing, but I don't get to talk about the guide dog stuff that much anymore ...