Actually the pictures you see at the begining shots that are in the ground - the later shots is what is left - they chewed them off like locusts!
It is a very interesting dynamic - to watch her teach the puppies and watch to see what trouble they get into - in particular because she is not that old herself. A few of them got in a kennel run and closed the gate on them selves - I opened the gate and they couldn't figure out this 'thing' closing them in. She walked in next to them and then turned and led them out. Very cool.