Didn't want to take over Tracilea's puppy post, but is this really a bad thing?? Butter has a litle bit of an underbite..her lil bottom black lip sticks out a tad, but she's never had any problems.
Actually to be honest, we (my family and I) love her underbite!
The only dog I've ever seen with a severe overbite was an acquaintance who had a badly bred Pomeranian and his top teeth were, I kid you not, inches away from his bottom teeth!
Special thanks to Jan!