The dominant sense in humans is definitely sight, but with dogs it’s not always so. They can locate food much more easily with their sense of smell, the sense of sight is really just there to aid the sense of smell. In many cases humans would confuse two people that look alike, but dogs won’t, unless they smell the same, which they never do. Just look at this pooch!
His owner had spent some time in the hospital and had lost a lot of weight, when he came home his dog couldn’t recognize him! Until he came close enough to smell him! Priceless!