"Apropos of doggie eyesight, just google "dog eyesight" and you'll get abundant links all of which will confirm that dogs's eyesight is very compromised compared to that of humans.   When you read a detailed post and find one serious inaccuracy of this sort you do have to wonder about the reliability of the rest of the post."

Steve. Here's the low down on dog's eyesight. It is true that dogs cannot see very well close up. Also, they see almost in monochrome, or at any rate cannot distinguish colours easily. The point I was getting at is that dog's eyes are very good for long distance hunting, not for close up work. That is because they have a much wider angle of vision than we have and they tend towards lateral vision where ours is binocular. That enables them to see prey over a greater angular range than we can. What's more they are longsighted. That means they can also see prey at a much greater distance than we can.

Think about it. It's logical. When a prey is a long way off, even a highly developed sense of scent would not be much use in locating that prey. But a dog whose eyes have evolved to allow it to see a prey when it's a long way off, can use its sense of smell when it gets close enough to smell it.