@gadifele.boerboels: The runt of a dog litter is the smallest and sometimes weakest puppy at birth. While not all litters have a runt, it's often due to factors like poor uterine attachment, genetic issues, or congenital abnormalities. Runts may face challenges in competing for resources and may require extra care, but many thrive and can even catch up in size to their siblings. Many runts are resilient and can grow to a normal size and enjoy healthy lives.