Have you ever noticed how your dog acts when you are approaching him from a distance? He sees you immediately, and he stops and stares; but it's obvious that he doesn't know who is coming toward him. You start talking to him, perhaps calling his name, but he is still unsure, although he will act interested. Finally, when you get close enough to him that he picks up your scent, he will run to you happily.
Your dog trusts his sense of sight the least. However, while smell is his most refined sense, sight is his strongest.
Dogs have no good biological reason to identify different colors. Though they can distinguish between certain colors, their color vision is limited and the colors may appear muted to them.
Dogs see more clearly than humans do in dim light. This allows for increased movement definition of prey animals. Although their ability to see detail is limited, they are quite exquisitely sensitive to movement, and are able to pick up even very slight movement of hiding prey. A stationary object may not be noticed from a distance, but the dog will see it as soon as it makes a move.
I like to hide from my dog and watch what she does when I am no longer in her sight. Of course, she finds me by smell, but it is fun to watch her.
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