Dogs' hearing is 16 times that of humans, and they can distinguish high-frequency and extremely low-decibel sounds. When sleeping, their ears are close to the ground, and they listen carefully to sounds within 4 kilometers in diameter. Prick-eared dogs have better hearing than lop-eared dogs. To be sensitive.

Dogs have a strong ability to distinguish sound sources. When they hear distant sounds, they will turn their ears and eyes to the sound source at the same time. This is its special physiological function.

For the owner's passwords and simple language, the dog establishes conditioned reflexes based on changes in tone. It can completely hear very soft passwords. Too high a voice is a stimulus to it, making it feel pain, panic, and even As for avoidance or rebellious behavior.

Puppies that are just 10 days old do not respond to sounds. They can gradually hear sounds and make whimpering sounds after 2 to 3 weeks.
Dogs have poor vision, but they have a wide field of vision and can "see six directions with their eyes and hear all directions with their ears." Its ability to perceive objects depends on the state of the object. It can see stationary objects within 50 meters, but it can sense moving targets up to 825 meters away.
Dogs are color-blind. In their eyes, the world is like a picture on a black-and-white TV. Guide dogs can distinguish red and green traffic lights based on the brightness of the two colors of lights; their dark vision is relatively sensitive, and they can detect light in weak The ability to see objects clearly under dim light is a characteristic of nocturnal animals.

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