With my own horse, I always allow him to stop everything and go to the bathroom- but other horses I have ridden carry on with their task as if they are simply passing gas. Were they trained to do this? Are there pro's and con's to both sides?
Of course I let my horse stop to pee- I don't think it's possible for a horse to pee an walk. Or is it?! Like I said, I am completely ignorant on the topic, and all insight is appreciated. :)