One of the most effective, poignant ads ever, with such strong visual and emotional pull.
Smart dogs love doing suitable jobs, so don't think this isn't a 2-way-street partnership. As it's such good p.r. for dogs and so invaluable to the visually impaired, here are the two organizations to which I contribute:
Guide Dogs for the Blind http://welcome.guidedogs.com/
and Guiding Eyes for the Blind https://www.guidingeyes.org/