"She liked things to be difficult," Wegman, shown here in 1995, says of Fay Ray, his second canine model. John Jonas Gruen / Hulton Archive / Getty Images Roller Rover is a definitive example of ...

He spoke with Jennifer Drapkin about photographing his Weimaraners, including Man Ray and Fay Ray. You once said you felt as if you were "nailed to the dog cross." What did you mean? In the early ...