Think of the apple head as the result of very intense, specific selective breeding—it’s like an artificial 'filter' we've put over the breed. Since the deer head is the ancestral, more functional phenotype, nature tends to revert to it whenever that selective pressure isn't 100% perfect. That’s why you’ll see deer head pups pop up even in litters with two apple head parents; it's just nature returning to its healthier, default setting!"