It's a bit difficult to tell from a pic but it looks either even or a bit under shot. If it is even the top and bottom teeth line up and meet perfectly, this is allowed by the standard. An even bite can remain that way or go over or under shot when adult teeth come in. If the bottom teeth come out a bit farther than the top than it is undershot and that seldonm corrects and usually gets progressively worse. An undershot job should not cause any health problems and oft times gives personnality. So unless you were hoping to show or breed this dog I wouldn't fret about it too much. It is caused by a recessive gene and does pop up occasionally.
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Tami |