The first clip show him very nearly approaching his limits, if you understand body language you can see he’s totally uncomfortable from start to finish, but there is a difference in being in a state of learning and a state of complete overwhelm and fear! We know dogs will not learn if they are over threshold in fear. Keep doings in situations that allow growth is vital, this situation would not allow growth, he’s over threshold and know longer feels safe. We had dogs up our ass for a while, and