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The pastoral dog breed include the dogs to work livestock. Sled dogs are healthy and powerful dogs because they are used for pulling the wheel less vehicle on runners. Some dog species are not available and they have become extinct and known as extinct dog breeds. People love to keep dogs because dog is a faithful animal but because of the allergic issues they usually avoid keeping dogs, however, the hypoallergenic dog breeds are for such people. The last category of dog breed is Police dog breed which is used by the police forces for detective purposes.