Dog breeds are groups of closely related and visibly similar domestic dogs, which are all of the subspecies Canis lupus familiaris, having characteristic traits that are selected and maintained by humans, bred from a known foundation stock. The term dog breed may also be used to refer to natural breeds or landraces, which arose through time in response to a particular environment which included humans, with little or no selective breeding by humans. Such breeds are undocumented, and are identified by their appearance and often by a style of working. Ancient dog breeds are some of the modern (documented) descendants of such natural breeds. Dog breeds are not scientifically defined biological classifications, but rather are groupings defined by clubs of hobbyists called breed clubs. Our list of dog breeds is based on AKC standards. Remember that each dog breed is different. Some dog breeds require lots of time that you will have to dedicate to groom and to exercise. Some dog breeds require little or no exercise but other dog breeds may require a walk three times every day. Please make sure you are making the right decision when you choose which dog breed is right for you.