The summer I spent working with a sheep hearder we use 2 of them to pack out while going to and from different fields both had been used for at lest 15 years and knew the trails by heart,they loved the sheep and dogs and would go just plain raving mad when a yote would show up. The Forest Service in our area used them to pack in new seadlings.Have seen the Mex's pack'em down so heavy I never thought they would move, Like Ray said though if they take in their heads they don't like you , for get getting them to move
