Dogs have become one of the most popular pets in the world, even earning the title “Man’s best friend”. Dogs are believed to be the first animal to be domesticated by humans. Dogs can be trained to perform a variety of different jobs including hunting, herding, aiding handicapped individuals and assisting the police or military. Different breeds of dogs are known for certain characteristics, so it is important that if one adopts a dog that they thoroughly research the breed. Many dogs have been bred through selective breeding, which makes certain physical and personality traits more prominent. It is also important to make sure that one has the time, energy and finances in place before they adopt a dog as they require daily exercise and play. Dogs are very intelligent with many of them learning desired behaviors and tricks. The typical lifespan of a dog varies greatly among breed, but the median is around eleven years old. Dogs can add companionship and value to a person’s overall well-being and health making them a great pet for many.