The dog distinguishes colors (except red) even if they are duller than those that we distinguish. 

True myopic, svision becomes blurry beyond 5 meters. On the other hand, he sees well up close.

The dog compensates for this lack of sharpness by good perception of movements, specific to predators. He is thus able to perceive 50 images / seconde while we only perceive 20.

He also has a field of vision that is wider than ours: he sees 240 ° while we only see 180 °.