Most mammals rely on scent rather than sight. Look at a dogs eyes, for example: theyre usually on the sides of its face, not close together and forward-facing like ours. Having eyes on the side is good for creating a broad field of vision, but bad for depth perception and accurately judging distances in front.
Instead of having good vision, dogs, horses, mice, antelope in fact, most mammals generally have long damp snouts that they use to sniff things with. It is we humans,... more