This is a good question and I am interested to see what people think..
I have read that some over bites can possibly correct themselves and the time frame ranges from 6-9 months.?? Also that it is more common then people realize.
If there is a under bite or bad OB these are less likely to correct themselves. The key THEN would be not breed the dog. Some breeders continue to breed, and some do not. But I don't think that an over/under bite always means bad breeding...... if 1 or 2 liter mates have bad teeth it can happen, kind of like humans.
My Poms have slight under bites, although they have been altered I was advised not to breed by my own Vet. (I wasn't planning to anyhow) So that's when I did my homework to look more into the why, and future steps I may need to take.
What other things could cause this in dogs? Besides flukes, and bad breeding?