Camping with a faithful dog is a joy. You don't need to worry about the dog leaving camp, ever, unless you do, of course. Your dog will likely just stay in the tent with you, lie down by the fire, and take in the crisp mountain air. Just another camping trip! No need to worry about your dog running around hunting things or getting into trouble with a bear when you have a faithful dog!
The best part about hiking with a faithful dog is that you don't even need a leash. You can simply hike with your dog, and know that they will stay with you, by your side, or tag along in front, leading the way. If you take a break, so will your dog. Just remember, it's nice to have a leash on hand, in your backpack, in case anything happens. One too many squirrels, a big group of hikers or another can't miss distraction. But otherwise, you really don't need it!