Dogs' noses are black because they contain melanin, which is because they are designed to better detect odors. Melanin on dogs’ noses is very helpful in catching odors better because they absorb and capture odor molecules.
Burning by sunlight
Most of the dog's body is protected by fur, and only the nose is directly exposed to the sun. The epidermis of a dog's black nose contains melanin, which is brown-black or black emelanin. It can prevent the DNA in cells from mutating from being exposed to ultraviolet rays in the sun.
Human aesthetics promote the evolution of dog nose color
For a long time, no matter which breed of dogs, dog owners only like to choose dogs with black noses to raise them. Although this is just a human aesthetic requirement and has no other meaning, it is also an artificial choice after all, and it will still affect the bloodline of domestic dogs.
The dog's nose becomes pink and tender, so don't worry, it is caused by insufficient secretion of melanocytes in the dog's body. Take some seaweed powder and nutrient solution. Do not eat food that people eat when eating dog food. It may also be caused by the lack of some trace element in the body! The reason may be that you see less sun! Taking it more exercise and basking in more sun will help. You can also go to the pet store to buy seaweed powder for your dog to eat! The owner must be patient, it cannot be changed back in a day or two!