We used to have a little, short mule that we would take hunting in the high, rough country all the time. We took him so much that if we left him home he would raise hell until the horses got back.
We would lead him out for about a mile then take the lead off and he was on his own the rest of the day. He would go anywhere we did, haul our packs, food and water all day and haul meat if we killed something. Never over loaded him but he sure could hold his own.
If we got into some steep, rough, rocky stuff and he couldn’t follow a horse he always found a way on his own. He was a great little packer, it was like having a good dog with you. One of a kind.