I have one horse that frequently unsnaps
his leads and unbuckles his halter. He does this by rubbing, so a regular snap
or the quick release snap don't work for him, nor a nylon strap halter, as
he gets them unbuckled by rubbing. He has been seen galloping down our road many
times due to his habit of rubbing his head. I now use a rope halter on him, with
either a bull snap or tied-on lead rope. I suspect some day he may find he
can rub the rope halter off over his ears.