This is Yellow.
While my son was playing with him I noticed a serious injury to his back and had to put him in isolation away from the other puppies and his master. Now, it is not going over well with the puppy boy(he is serenading me with a chorus of 'puppy,puppy,puppy' at the top of his lungs as I type) but luckily it is time for lunch and then a nap. Surgery is scheduled for nap time so that Yellow will be able to recover comfortably with his beloved master. I'll keep you posted on his recovery!