Читать книгу Collins Good Dog Behaviour: An Owner’s Guide - Gwen Bailey - Страница 23

Dogs can see less well than humans. They can see colours but not as well as we can, and they cannot differentiate easily between certain colours, such as red and green. A dog looking for a red ball, for example, on green grass is more likely to be using his nose than his eyes.

They do, however, see better than us when less light is available. A reflective layer at the back of their eyes allows them to make better use of the light entering the eyes by trapping and reusing it. This is why their eyes shine eerily when they are caught in car headlights or a torch beam.

While we are able to make out static shapes easily and can quickly differentiate between two objects, dogs see things better as soon as they move. They can detect movement on a very small scale, helping them to be efficient hunters. In our world, it enables them to notice subtle body movements, which allow them to detect, a fraction of a second before we have said anything, that we are about to take them for a walk.