Canine sense organs: Overall dog’s sensory organs are highly developed. Certain breeds have more acutely developed senses than others. For example a Hound dog’s sense of smell is more acute than a Chihuahua’s.
Visual: Dogs can spot moving targets with great accuracy even at long distances and in the dark. Dogs do not have a good sense of colors though and their close vision is sometimes lacking in the ability to detect detail. Where their vision is lacking their sense of smell more than compensates.
Tactile: The hair in a dog’s body is like a receptor and each hair helps the dog to be very aware of his surroundings.
Olfactory: Almost unrivaled in the animal kingdom a dog has about 200 million scent analyzing cells located in their noses. This is compared to the only five to twenty million cells that humans have in their noses. Some special breeds of dogs can have as many as 300 million scent cells. Of course the olfactory processing part of dog’s brains is also about forty times larger than that of humans as well.
Taste: Dogs do not have the same amount of taste buds as humans do. Dogs have approximately 1,700 where as us humans have about 9,000. This would explain why a dog is not as picky with his food as we are.
Auditory: As dog’s ears are able to move in different directions, it is easier for dogs to pinpoint the exact location of a sound’s origin. The frequencies which dogs can hear are almost twice that of humans and they also can pick up sounds at roughly 4 times the range of humans. For example a sound that you can hear at 20 meters a dog can detect at 80 meters.