Dogs are often known as mans best friend. Dogs have been around humans for thousands of years. Dogs are also used in the police department to track criminals and smell out things like drugs or other illegal substances. 

 

A dog can smell about 100,000 times better than humans can. This is because they are often used for hunting. Their keen sense of smell helped them find animals. They can smell and hear things from miles away. They also used their whiskers to help them see in the dark.