This year I have done a lot of backpacking in Southern Utah and Arizona. In those area I have kept her on a leash do to rattlesnakes, bear and mountain lions. I like trekking poles and it makes it almost impossible to use them. REI sale a leash that you wrap around your body so you dont have to hold it. I am going to try that.
Other area I dont but if there are people on the trail I do. I have a pitbull, though she is friendly a lot of people are still afraid of them