According to the Annenberg Foundation, examples of artificial selection include the breeding of thoroughbred racehorses, and the breeding of animals used for meat, such as domesticated cows, pigs, sheep and chickens. Other examples include dogs and cats bred to have certain desirable characteristics.
Wikipedia explains that artificial selection, also known as selective breeding, occurs when people choose to breed specific animals and plants for their particular traits. The Annenberg Foundation explains that people breed racehorses to develop traits that produce faster horses. Domesticated cows, pigs, sheep and chickens are bred to yield mass amounts of delicious meats. Dogs and cats are bred to be friendly companions to humans.