Selective breedingA breed is a particular group of domestic animals or plants with uniform appearance and behavior, which differentiate it from other animals or plants. While domestication is the process by which a population of living organisms is modified at the genetic level, through generations of selective breeding, to accentuate traits that ultimately benefit humans. The deliberate breeding of animals and other species to obtain the characteristics required by humans is called selective breeding. It includes breeding methods such as inbreeding, line breeding, etc. The animals produced are domesticated and breeding is usually carried out by an experienced breeder. The organism I selected for selective breeding is a Labrador retriever dog because Labrador retrievers are the most popular breed in the world. Although research has made great progress in developing a healthy large breed Labrador companion dog, the research is not yet complete, which means there is still a long way to go. Labradors are selectively bred for their hunting qualities. They were bred to have webbed feet so they can swim through water to retrieve birds. When retrieving the bird, it is desirable for the dogs to have softer mouths so that the bird cannot be damaged. The Labrador Retriever's country of origin is the Canadian province of Newfoundland, along the east coast of Canada. The Labrador Retriever is not native to Labrador. The male Labrador Retriever reached a maximum height of 24.5 inches while the female Labrador Retriever reached a maximum height of 23.5 inches. Its weight varies from 30 to 36 kg. Its color can be black, yellow or chocolate and it has short, straight and dense fur. The coat is easily taken care of with just one... half of paper......and the weight of male Labrador Retrievers varies from (40 to 45 kg) of the female Labrador Retriever (from 36 kg to 40 kg), and a long hair, science helps us achieve this through a selective breeding program that can include 20 to 25 generations to get these specific breeds domesticated. . Science also helps us achieve the task by continuously consulting paleontologists to research the skeletal structure of dogs and compare the existing bone and body structure with previous breeds. In this regard, the Associations have established strict rules and regulations for breeding and have created a way to unify all breeders into a wide-ranging system in order to promote wholesomeness and reward breeders who consistently produce specifically heavier puppies, taller and with a longer life expectancy. for this purpose by adopting crossed lines and standardized breeding practices