Waiting to breed a dog has many benefits. It ensures the health and safety of both the dam and sire, with males not usually suitable for breeding until at least 1 year old and females best bred when they are fully grown.
Later age also limits risks of stillbirths in female dogs, reduces fertility issues in male dogs, improves litter size outcomes, prevents unhealthy pregnancies in young or old dams, and increases chances of Kennel Club registration for litters from 12-year-old dams.