Yes that is true. Despite the common misconception that dogs only see black and white, dogs see the world in colors, but differently from us.
We see three colors, the dog only two. Dogs can only see the colors yellow and blue-purple. They see red and orange as if they were shades of yellow, and they can’t tell green from white, and green-blue from gray. In addition, our eyes see the colors intense and shiny, while they perceive colors only faintly and in pastel tones.
But color sensitivity is not the only characteristic that distinguishes our senses from dogs:
In the past, dogs used to hunt at dawn and dusk. So they developed a greater sensitivity to light, which enables them to see even in poor lighting. This is possible thanks to a greater number of receivers that are activated in low light and thanks to a structure that acts as a mirror, reflecting light inside the eye and causing greater stimulation of the retina. Because of this, when we take a photo with a flash at night, their eyes turn yellow-green.
The dogs’ eyes are also very sensitive to movement, especially in the dark and at great distances. However, your vision is more blurred than ours.
Another difference between the dogs’ sense of sight and ours is the field of vision: our eyes have a frontal position and the fields of vision of the two eyes overlap in a wide space known as the binocular field of vision, thanks to which we perceive the vision in three dimensions. Instead, in many dogs, the eyes are sideways. This makes them see more peripherally, but reduces the range of binocular vision. To measure the distance of an object, dogs must align their heads so that the object enters the zone of three-dimensional vision.
Dogs’ hearing is more sensitive than our hearing: dogs can hear sounds four times longer and can even perceive ultrasound (i.e., high-pitched sounds that are beyond our perception limit). In addition, thanks to the independent movement of their ears, which can rotate to point to the origin of the sound, dogs can find the exact source of a sound, which is very helpful when hunting.
With up to 280 million receptors, the dog’s olfactory sense is much more developed than ours, which has only 5 million olfactory cells. Their sensitivity to smell varies according to their breed and size, as well as the smell they perceive, but can be more than 100,000,000 times higher than our sense of smell. This means that dogs need a lower concentration of odor particles in the air to detect an odor. Their keen sense of smell also allows them to recognize the components of complex chemical mixtures. Thanks to this sensitivity, dogs can filter out the smell of certain substances such as drugs, explosives, etc.
SENSE OF TASTE
Dogs can distinguish sour, bitter, sweet and umami tastes, but cannot recognize a salty taste. They also have special receptors on the tip of their tongue to taste water. However, their ability to perceive aromas is generally much less developed than ours, considering they have 1,700 taste buds and we have 9,000. Dogs compensate for this “disadvantage” with their highly developed sense of smell. In addition, they are much more sensitive to the umami taste than we are: foods with this taste, such as meat, are rich in protein and amino acids, so this heightened sensitivity reflects their dietary preferences.
SENSE OF TOUCH
The sense of touch is located in the skin all over the body. There are different types of receptors on the skin that can sense pressure, temperature, and pain. But not all areas of the skin show the same sensitivity. The nose and nose area are particularly sensitive areas. In addition, dogs have special hairs known as whiskers, with which they can increase the tactile sensitivity of certain parts of the body and thus compensate for their thick fur. Whiskers are long, rigid, and extremely delicate hairs that are on the side of the nose, above the eyes, on the cheeks and chin, and under the jaw. When touching the objects around them or when vibrating from air currents, whiskers provide the dog with information about the space around him and help him to move safely even in low light.
Dogs are the result of their evolution: their senses evolved during centuries of adaptation to their environment, and although most dogs today have someone to attend to their needs, their senses still come from their ancestors who were fine for hunting Needed a nose, a movement-sensitive eye, and good hearing.