Ohhhhhhh, those poor babies! I just can't imagine how anyone could dump puppies like that, it's just beyond me! Thank you for taking the little guy and I'm so glad that one of the others found a home. Do you know what is going to happen to the third? I'm sure that Pyr Rescue could help. Let me know if you need contact info and I'll be happy to help you.
Regarding the little guy's jaw. I believe that is called an overshot jaw (overshot b/c the upper jaw extends past the lower jaw) and it is a breed fault, so that may be why he was dumped (beyond the fact that the person that dumped him is sub-human, but I better not go there). If you contact Pyr Rescue in your area, they may know who is breeding dogs with this fault, so they may be able to help make a case against this person for animal abuse. I'd love to see their breeding stock spayed/neutered at the very least, best case I'd love to see the dogs re-homed to someone that loves and appreciates them beyond money makers!!! Your vet (or maybe Pyr Rescue) will be able to tell you if any special care will be required for his jaw as he grows.
Congratulation s on your new baby, I know that he will be a wonderful addition to your family! I can't wait to see more pics as he grows. Have you picked out a name for him yet?