Amazing Facts You Might Not know About Dogs - Part 3 of 20

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Your dog is your best friend but there's a lot you might not know about him!

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Dogs (Canis lupus familiaris) are domesticated mammals, not natural wild animals. They were originally bred from wolves. They have been bred by humans for a long time and were the first animals ever to be domesticated.

Different studies suggest that this happened between 15.000 and 100.000 years before our time. The dingo is also a dog, but many dingos have become wild animals again and live independently of humans in the range where they occur (parts of Australia).

Today, some dogs are used as pets, others are used to help humans do their work. They are popular pets because they are usually playful, friendly, loyal, and listen to humans.

Thirty million dogs in the United States are registered as pets.[5] Dogs eat both meat and vegetables, often mixed and sold in stores as dog food. Dogs often have jobs, including police dogs, army dogs, assistance dogs, fire dogs, messenger dogs, hunting dogs, herding dogs, or rescue dogs.

Dogs are sometimes referred to as "man's best friend" because they are kept as domestic pets and are usually loyal and like being around humans.

Dogs like to be petted, but only when they can first see the patter’s hand before petting; one should never pet a dog from behind.

Dogs can smell and hear better than humans, but cannot see well in color because they are color blind. Due to the anatomy of the eye, dogs can see better in dim light than humans. They also have a wider field of vision.

Dogs and humans
Dogs are often called "man's best friend" because they fit in with human life. Man refers to humankind and not just guys (Old English). Dogs can serve people in many ways.

For example, there are guard dogs, hunting dogs, herding dogs, guide dogs for blind people, and police dogs. Some dogs are trained to smell for diseases in the human body or to find bombs or illegal drugs.

These dogs sometimes help police in airports or other areas. Sniffer dogs (usually beagles) are sometimes trained for this job. Dogs have even been sent by Russians into outer space, a few years before any human being. The first dog sent up was named Laika, but she died within a few hours.
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