Got 3 shorthorn heifers. All very gentle and halter broken. They lead fairly well for short distances - from the pen to the wash area and chute. None lead well for greater distance - laps. One is especially difficult, pulling back often and jumping forward when she finally does go. Any suggestions welcome. We are being persistent with the pull and release technique, but are physically and mentally tired from the tugging and frustration. What can we do? We've never had shorthorns before and wonder if this is a common problem with them since they are so gentle. What is a reasonable goal for distance - laps? What should we do?