Although easier said than done with a wriggling puppy, potential owners should check the puppies bite which should be a “scissor bite” (the top teeth nestle neatly against the lower teeth) or, at worst, “level” (the upper and lower teeth touch). A small minority of puppies have an overshot or undershot bite where the upper teeth are respectively materially further forward or behind the lower teeth. Apart from being unsightly a, say, overshot bite has the effect that the lower canines create holes in the gums of the upper palette. Sometimes the condition will correct itself as the puppy grows or when the adult teeth appear.
Often the condition will not correct itself so it is advisable to get an objective opinion from a vet. Orthodentistry is a possibility or the offending canines can be removed. An overshot or undershot bite is considered a fault when showing. If possible, also check the dam and sires bite.