My mom's Carin has a major underbite. We call her the Warthog, but we love her nonetheless.
It's a common thing in dogs, and if it doesn't alter their eating or causes pain, I don't quite see the problem.
Posted is a picture o my Mom's Cairn and you can't even tell, unless she looks up at you and has her tooth sticking out...Hence the Maizey the Warthog.
