Dogs ‘see’ the world through their nose much like we humans ‘see’ the world through our eyes. No, not literally, but think of it this way- blindness (minus the danger roads present) wouldn’t present much of a handicap at all to today’s domesticated dog; they could continue to live out their lives in the perfect happiness they always have! Take away a dog’s sense of smell, however, and you’ve crippled him far worse than blindness would cripple a person.