The oldest Boo pups on the ground are about 18-20 mos I think. He was bred just a few times prior to his NFC. I had a litter which is now 16 mos old. Of that litter 3 pups have run their first derby. I have one that is ready to run a derby but won't for another 2-3 mos (I just don't run many derbies). There is another 1-2 pups in FT training from that litter (7 of 8 I think). The pups are nice. I think the females all weigh 55-60# and the males 65-70#. None are vocal, and a general comment I hear from the owners or trainers is that they are good markers, quick learners, biddable, stylish pups.