Pet diapers have a more useful function, that is, they can assist in training dogs to urinate, especially for puppies. Because dogs have a very sensitive sense of smell, their olfactory nerves are densely distributed on the nasal mucosa, occupying an area 4 times that of humans, and their sensitivity to smells is more than 40 times higher than that of humans. Therefore, dogs feel more strongly about the inducer in the pet urine pad.