Greyhounds rely more on their vision than they do on their sense of smell; hence the term "sighthound." Surprisingly though, the greyhound breed does not have great eyesight when it comes to seeing stationary objects.
They exhibit incredibly keen eyesight for moving objects but aren't so adept at recognizing objects which stand in place. This is because these ancient canines have been bred for hunting fast-moving animals like hares. Greyhounds are bred to run at top speeds while still being able to visually spot the moving wild game.