Chocolate Labradors have remained steadily popular throughout recent years. Nevertheless, the dominant black color means that the demand for chocolate labs remains limited, ensuring continued rarity within the breed. Continual breeding of black dogs will only produce black offspring. If dogs with a Bb gene only mate with dogs with a BB gene, the b gene will carry on to future generations, never to be expressed. Brown is a recessive trait, so both parents must carry it to produce brown offspring. Breeding litter from this shallow gene pool comes with some health risks. While the gene for a chocolate coat is not bad for a dog's well-being, issues arise when dogs are bred for color, not health.