The tail of a boxer is typically docked before the cartilage is fully formed, between 3–5 days old. Like fair-skinned humans, white Boxers have a higher risk of sunburn and associated skin cancers than colored Boxers. The extreme piebald gene, which is responsible for white markings in Boxers, is linked to congenital sensorineural deafness in dogs. It is estimated that about 18% of white Boxers are deaf in one or both ears, though Boxer rescue organizations see about double that number.In the past, breeders often euthanized white puppies at birth. A 1998 study of Boxers in the Netherlands showed that 17% of Boxer pups were euthanized because they were white. Our great line of sires all trace directly back to this female. She was a substantially built, low to the ground, brindle and white parti-color, lacking in underjaw and exceedingly lippy. As a producing female few in any breed can match her record.