WE BOUGHT VIOLET AND FLORENCE WHO ARE LITTER SISTERS AND KEPT TWO OF VIOLETS PUPS CORA AND CHLOE, THEN TOOK BACK THERE SISTER PING PONG AT 12 WEEKS. WITH NO MORE PROBLEMS THAN WHEN WE GOT STAN OR OLLIE WHO CAME WITH OUT A SIBLING. WHATS A FEW XTRA PUDDLES AND TURDS!!!! YOU ARE GOING TO BE CLEANING UP AFTER ONE ANYWAY. JUST HOPE TO GOD THIS PERSON NEVER DECIDES TO HAVE CHILDREN, IF THEY CONCIEVED TWINS WOULD THEY GIVE ONE AWAY?