Flyer is in an agility foundations class and we were working on jump tunnel combination..We had done several runs and were getting ready for our next run and the dog ahead of us was jumping 16 or 20 inches (we were jumping 10 inches)..I saw our trainer by the jump and assumed she changed it..ooooooppppppppppssss ... we come out of the tunnel and I tell Flyer to jump and look at the bar and think..ohhhhhhhhh shhh***********t....brave boy tried it and hit the bar with his chest and front feet.... of course we bring him back to the jump and put the bar down to 4 inches but he didn't want to have anything to do with it..interestingly enough we did get him to do it in the opposite direction and it took a few more tries to get him to go in the direction where he hit the bar..guess we'll be playing our jumping game a bit this weekend..