In the wild, where form almost always follows function, canines have scissor bites. So breeding without the intent of eliminating such a fault is going backwards. The dog can still be valuable to a program but I'd be breeding the trait out. I'd still grab a pup even with a bad bite if it's parents had the rest of the package, but I'd put it to workers with better jaws and move that bite out of the program as fast as I could.