
i bought a pup with an overbite, the breeder made me fully aware of this and i was happy to take him as i wanted a working pet and not a show dog. as it turned out he is a fantastic working dog and even if his bite had been correct he grew too oversize for showing! his gap between the two jaws was noticeable at 8 weeks although not huge about the size of a little finger tip. it did not improve as he grew and he still has a noticeable gap between his jaws. one of his lower canines ending up growing up into the roof of his mouth causing quite a large ulcer, as a result he had to have his canine reduced in size and a procedure similar root canal carried out. this was the better option than trying to remove a well rooted healthy canine as they are difficult to remove.
i asked many people about this and was advised that the gap has to be very small, no bigger than the head of a match stick to have a chance of coming right, my pups was bigger and did not come right. he was almost 2 before he had problems and had to have the surgery but has had no further problems.
the gap if small may come right but just bear in mind that your pup may need some sort of surgery as even a small overbite in my dog caused problems. hopefully you breeder has provided you with insurance, continue this just in case and plead ignorance if questioned, a decent compant should cover any work needed as it is not routine treatment! i claimed for my dogs work and they never questioned it :-)