The phrase "dogs look down on people" often carries a derogatory connotation. But where does this phrase come from, and what is the basis for it? Why do "dogs look down on people"? Many people wonder about this. Actually, it mainly relates to the eye characteristics of dogs. When dogs look at people, their eyes appear smaller than they really are, so the humans no longer seem like "giants", which explains why even small dogs may bark and lunge at people.

        Dogs have relatively poor vision, with eye adjustment ability only about 1/5 to 1/3 that of humans. A dog’s perception of an object depends on the object’s state. For stationary targets, they can see clearly within 50 meters; for moving targets, they can sense distances up to 825 meters.

        Dogs have good farsightedness, which is very useful in hunting. Most dogs can’t focus on objects closer than 25 centimeters. Dogs’ visual field is very wide, with monocular horizontal vision of 100 to 125 degrees (humans only 90 degrees), upper field of view 50 to 70 degrees, and lower field of view 30 to 60 degrees. Binocular vision can reach 250 degrees. They see objects ahead more clearly, and because a dog’s head movement is very flexible, they can achieve "eyes observing six directions, ears listening in eight directions."

        Due to the structure of dogs’ eyes, typically humans appear smaller in their view, which is the origin of the saying "dogs look down on people." This has actual basis. Although dogs’ vision isn’t particularly sharp, it still plays a significant role, so daily eye care for dogs should not be neglected.