i mated my girl [ large breed ] 3 weeks ago on day 21 and 23 of her season, had 2 really good ties of 20 and 25 mins, i also have other girls and everytime they sniff at her back end her tail flys up in the air, she is fine in herself no discharge, eating well and in good spirit, it's just baffles me that she is still flagging at this stage , anyone got any ideas thanks