Had about 4 mixed beef cows domino last week so we now have 4 new heifer calves. All look to be doing fine except one has a problem......though to describe. Anus (more like the sphincter) seems to be missing, more of an open hole in the back. I noticed at birth it had a large black bag of waste partially showing, but it was gone the next day and now the hole is there. Stools look fine and the calf seems to be eating and getting around fine. Anyone ever have this happen? Any suggestions?