Dogs can smell and hear very well, but can not see well in colour or they are colour blind.
The usual life span of a dog from pup to an adult is about 10 years or more.
Like wolves, wild dogs travel in groups called packs. Packs of dogs are ordered by rank, and dogs with low rank will submit to other dogs with higher rank. The highest ranked dog is called the alpha male. A dog in a group helps and cares about others.
Dogs have lived with people for at least 14,000 years. Dogs can serve people in many ways. They are often called "man's best friend". For example, there are guard dogs, hunting dogs, herding dogs, and guide dogs for blind people. Dogs have even been sent by Russians into outer space, a few years before any human being.
There are at least 400 breeds (kinds) of dogs. Dogs whose parents were the same breed will also be that breed: these dogs are called purebred or pure pedigree dogs. Dogs with parents from different breeds no longer belong to one breed: they are called mutts, mixed-breed dogs, hybrids, or mongrels. Some of the most popular breeds are sheepdogs, collies, poodles and retrievers.
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Dog Breeders, Dogs training, pets names. A dog is a mammal from the family Canidae. It has been domesticated by humans for a long time. Its other name is canis familiaris. It can be a pet, because it is usually friendly.
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