I was thinking of breeding my coco but I have a question. She is is PERFECT health and has good lineage but she has an underbite. Some have told me that this makes her not able to breed. That because of her underbite this is a defect and she shouldn't be bred. I just wanted to ask about this because I am puzzled as to why her teeth would have anything to do with the health of her puppies

She is very healthy and was the only pup in her litter with the underbite.