The bite can go back and forth between 8 and 16 weeks of age. Once the adult incisors are in the bite is pretty much fixed. You can have the top puppy incisors pulled so that the adult incisors come in and hopefully lock the bottom ones behind it. A true undershot or overshot jaw isn't in the placement of the incisors but in the jaw itself. The premolars will not line up correctly in a truly bad bite. A bad bite is recessive so that the dog showing the bad bite is homozygous for an undershot or overshot jaw. If they are bred to a dog that doesn't have a bad bite you still have a chance that half of the litter will have bad bites unless the dog with the good bite is homozygous dominent for a good bite. It's not that easy to breed out and really shouldn't be in your breeding program.
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Tami |