It really depends on the dog. I've got a Bernese Mountain Dog, and she stays right at my side. I bring a bed for her and she sleeps in my tent or by me on my cot if i'm staying in my friend's trailer. The only time she gets audible is if someone approaches me while i'm sleeping then she'll growl. But otherwise she's quiet, calm, and happy as a bean to be with the pack. My friend's lab on the other hand is compelled to sniff any and everything within range...so he has to be tied up if we're not supervising him. So, i'd say it comes down to the dog and its training. From an early age I took my doggie hiking, camping etc. with me and she learned to always stay near me. Some of that is her breed instinct and some of it me reinforcing it.
The decision of whether to take or not to take her depends on the location and activities. Long hours in the sun, yeah, not good for her breed. Lot's of shooting...also not her thing. Also if there's a risk of bears/wolves etc. and i'm just in my tent, i wont take her. She's a muffin most of the time, but she gets protective of me if she senses a threat...and I don't want her charging a bear or something while I'm looking for something to scare it off with. I'd loose my sh!t if something happened to her.