My great friend Ed of Cape Clear, many moons ago, was provided with a half-trained guide dog (he being blind). It was probably the world's second worst guide dog*, but he loved it as a doggonality, and doggedly defended it against critics who pointed out that it was downright dangerous, despite the obvious fact that it was.

*The worst is reputed to have linved in Germany about 20 years ago, and to have killed three owners.