The pubic hairs had been a gift from his genes when he turned twelve. Had it not been for the boost of hormones he may not have been able to bludgeon the savage dog in the head with a rock later in the year. It was the first living creature he had ever kill in order to protect himself.
When a dog tells you 'its over', it doesnt know the meaning of soft tones. When a dog makes a threat, it does not curtsie.