We find pockets of diversity to strengthen the Mastiff gene pool in rare haplotypes that have an historic reference in literature and art for the breed. We were surprised by 3 pups presenting rear dew claws in our April 2015 Diversity litter: JOSEPH'S BEST KEPT SECRET X WOLFE CREEKS BOSS HOSS. In the early years 1820's till the turn of the century the rear dewclaw or fifth toe was considered to be a sign of purity in the Mastiff, indicative of great size. In the 1930's we find writings that indicate about half of all mastiffs whelped during that time had the rear dews. It seems that the fifth toe/rear dew declined after the second World War, we found little documentation about this trait in the post war period.