I am encountering some serious problems with my blm. He did great growing up. Anything I showed him he did great. Well we collar conditioned our pups the other day(me and my friend ex-trainer) are collar conditioning our pups on obidience and his flew threw it, and the pups are brothers. And mine didn't do so hot. He had a hole that we had to go back and fix on sit. When we apply the pressure of here. We would put him sitting walk about 10 yards away and call him here and he wouldn't stay sitting because he was so worried about comming to me to avoid the pressure. We went back and made sure he understood sit and made sure he knew not to get up before telling him here. Well yesterday we tried again and the same problem has occurred he won't stay sitting. We take him back put him sitting give him a whip with the healing stick and try again but nothing seems to fix it. Any help would really be appreciated. Sorry for the long post. Thanks in advance!!