Animal breeders consider which characteristics are desirable in the animals they’re breeding, and then select animals to breed to produce offspring with the desirable traits. For example, someone that is breeding champion show dogs may specifically look at the breed characteristics and pick dogs to breed based on how closely they exemplify the breed characteristics. Animal breeders may work with domestic animals, such as dogs or cats, and they may also work with farm animals such as horses, cows, chickens and pigs. They are not just responsible for determining which animals to breed, but are also involved in the care of the animals. They need to make sure that the animals are vaccinated, monitor them for illness or injury, feed them, and clean their habitats.