The simple answer is dont breed. Your new so why a litter? Just enjoy working the dog you have, you mention the staff has a nice temperament, is powerfull and fast, hardly touching the tip of the iceberg for a sire of pups, i would also suspect pups from such a union would be squat and slow, but thats just me, there are far too many litters around that will get passed from pillar to post, why add to the number...........