Humans and some other predatory animals, such as wolves, have two forward-facing eyes located side-by-side. This is called binocular. Because each eye views a scene from a slightly different angle, we get two separate images which are combined into one image in the brain. This is called stereoscopic vision, which makes what we see more three-dimensional and gives better perception of distance.
The binoculars (binocular vision) gave the wolf excellent forward vision of the sheep.