Question

Have you seen a dog sniffing here and there? What do you think it is trying to smell?

Answer 1

The dogs are known to be the animal which has great ability of smell. It has an additional olfactory organ which is meant for smell. It increases its ability to smell by several folds.

Complete answer:
Dogs are the most loved domestic animal which have a very strong sense of smell. The sense of smell is around 10,000 to 100,000 times greater than any other animal of humans. They have better scent receptors. For example, if humans have 1 receptor, the dogs have around 50.
The dogs can sense and smell objects as for as 20Km away.

The dogs are found sniffing here and there. The primary sense of dog is the smell. The dogs sniff in order to gather the scent. Dogs sniff in order to gather the scent of the urine of the other dogs in the pavements, trees or around. It helps them to know who is around in their neighbourhood. It also helps the dog to know the gender of the animal present or its reproductive status. The sniffing also helps them to know about any food source present in the surrounding.

The dogs are even trained so that they can easily smell the presence of unwanted objects, people or any type of anti-social activities. These dogs are used by the police and army professionals.

Note: The main organ of sense in humans is vision whereas the dogs are dependent on both smell and sight to access and communicate with the surrounding. Dogs apply brain power in interpreting smells.