The eyes of a dog are meant to see prey. They usually see better at dusk, and can spot moving things better than things that are standing still.
Dogs are not color blind – they can see blues and greens. They have a wider angle of vision than we do. They can see between 200-270 degrees of range where we can only see 160 degrees.
The dogs with the best vision are called sight hounds such as greyhounds and salukis.