For millions of years, dogs are considered as a loyal pet of man. From the time of early man itself, dogs are found along with man. It helped them from wild animals and many dangers in many ways. Jackals and wolfs are the ancestors of these domestic animal. These animals are best hunters and guards. They are always ready to face any risk for their master. And well trained dogs do many works instead of man. They are funny too. Their friendly nature makes them different from other domestic animals. Many varieties of dog breeds are available in the market. This makes dog breeding a good business too. Other business field related with dogs is the dog Halloween costumes field.