Can we resurrect this thread. It has come up. I have been breeding back to try to solidify some traits in an outcross. Some underbites have cropped up. I think most people leave them in. From my understanding they are recessive type traits that are probably polygenetic. One female came out gapped undershot. It seems to be getting worse. I’ll probably cull her. I would probably still breed tight as I feel these individuals are worth it. I did some reading on this subject. There’s a concept called genetic purge. Basically it says as inbreeding goes up. Traits that are homozygous recessive show themselves and can be eliminated. You lose some vigor but it generally corrects with a outcross. My plan going forward is to continue to have some coefficient of inbreeding on broodstock. Limit the genes that come into my gene pool. Evaluate pups early for underbites. If present cull early. Seems you save yourself from having the temptation of a badly undershot dog who is athletic and may be the smartest pup you have.

Any ideas?