They have been bred by humans for a long time, and were the first animals ever to be domesticated. They are a popular pet because they are usually playful, friendly, loyal and listen to humans. Dogs often have jobs, including as police dogs, army dogs, assistance dogs, fire dogs, messenger dogs, hunting dogs, herding encyclopedia of dog breeds pdf, or rescue dogs.
A dog is called a puppy until it is about one year old. 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 have four legs and make a “bark,” “woof,” or “arf” sound. Due to the anatomy of the eye, dogs can see better in dim light than humans. They also have a wider field of vision. Packs of dogs are ordered by rank, and dogs with low rank will submit to other dogs with higher rank.
A dog in a group helps and cares for others. Domesticated dogs often view their owner as the alpha male. This graph shows the correlation between weight and lifspan. Different dog breeds have different lifespans. In general, smaller dogs live longer than bigger ones. The size and the breed of the dog change how long the dog lives, on average. Great Danes have lived for ten years.