Meant no offense on your relationship w/your dog. Hope none was taken. I was merely concerned that you might lose your dog and couldn't bear the thought of a fine Dobie (or fine mixed-breed for anyone else reading who might have one) getting lost - even for just a couple of hours. In my experience, there are only a very small percentage of dog owners who are both Alpha-dog in the family pack & who have also obedience trained their dogs either formally or informally. Please accept my apologies if I have offended you in any way.
[Besides my boss telling me about him losing his dog, I have seen people, on the trail, huffing & puffing running after theirs, asking me "Have you seen a dog...", or dogs running lost alone both on & off trail in state parks. IF your dog does get loose & you need to locate it, remember, they don't always stick to trails since what interests them is prob. not on the trail - other than another hiker. However, don't get lost yourself searching off-trail.]
I used to carry a 40 foot long canvas training lead, in addition to my 6 foot leather training lead attached to a sliding-chain-through-ring collar. People call this a "choke" collar. While on the trail the 6' lead was always used with the dog(s) at a "heel" ("foose") position next to my leg.
[NOTE: Any reader who thinks this sliding-chain-through-ring collar is cruel in all likelihood does NOT understand in the least canine psychology. If you want to train a dog, you need to understand wolf-pack psychology. The dog will NEVER be able to comprehend human psychology. HOWEVER, PLEASE DON'T INTERPRET THESE WORDS TO MEAN THAT YOU NEED TO BE ROUGH/CRUEL WHILE TRAINING YOUR DOG. Quite the opposite, use of proper training equipment/techniques makes the training more gentle/controlled. YOU SHOULD NEVER HIT YOUR DOG. LIFT, SHAKE & SCOLD YES. HIT NO. Hitting is NOT in a dog's wolf-pack mentality. It doesn't communicate properly.
Unless one has already trained their dog to be afraid of coming back to them (e.g., by hitting them, or even scolding them when they finally do return), "play posture" is the way to get dogs (even run-away neighbor's dogs) to come to you. Praise them when they finally return - this makes "coming" a pleasurable experience for them. One of my neighbors dogs (a Siberian Husky) will always come to me, NEVER to him - I've never even trained this dog - it's the demeanor, tone of voice, & play-posture, & then praise - his two children have seen me do this when i get their dog to "come" - they now do it & the dog now comes to them - but still not the father - for obvious reasons.
I used to love hiking with my dogs (all three have since died of natural causes/old age - prob. w/me soon to follow. they all died at home/vet, NOT on the trail ). The dogs typically get enough exercise during 12-14 hrs a day of hiking, but your extensible/extendable lead sounds like a good idea. I would only suggest, if you feel that the lead could eventurally break, that you bring a NEW back-up six foot leather/canvas training lead. You might be thinking that hking with a human is NOT a lot of exercise for a family dog (even a large dog). However, (check with your vet also), I believe it is. First, they are family dogs, not wolves & so, in most cases, are not in the same cardio-vascular physical shape as a wolf. Furthermore, dogs spend a lot of time resting/sleeping - preparing for the "big hunt/chase" which in their lives never comes as we provide their food in a bowl (as we should).
LNT poses other issues when hiking with your dog. At the risk of being a heretic, I take a slightly diff. view on some LNT matters. Having had over 20 undergrad/grad bio courses (including some dealing with Ecology & the Environmnet - i was also one of the first members of the Cousteau society & so consider myself a friend to the environment), in most (not all) cases, I'm not about to pack a canine's *BEEP*'s out. For me it depends upon how heavy is the human interaction with the environment. If it's a place where there is not much human interaction, I don't believe the ecology is that fragile that I can't bury my dog's excrement or leave it as it is - again, depending upon the local/environment. Hey...the foxes, coyotes, & wolves are not burying theirs - what is one more canine (now dozens/100's of canines over the course of a year is another story - this is what governs my decisions in this matter, as would local "laws/regs" hopefully established by knowledgeable ecologists familiar with the local ecosystem). If you need to pack out, I used to double-bag each "dump" in sandwich bags. simply invert one over your hand & grab. pull the bag around it, twist & tie off & place in a second bag. Then place the double bag in a larger third bag.
My dogs, never had worms (over 42yrs combined ages), or any other diagnosed diseases, other than as very young pups - which is common for pups to need de-worming. DON'T let your dog sniff/lick other animal droppings. Dogs like to do this, mine learned not to - at least if i were nearby.
b/f going on the trek, have your dog checked over by your Vet if it hasn't been checked recently. Remember, your dog can be treated with the same drugs you carry for pain/sore muscles/fever/lower GI issues, etc - dogs are (were??? i'm a bit dated) often used for human drug testing. Just calculate the dose based upon the dog's body weight. Make sure all of your dog's vaccinations are up to date. I don't know about Lyme's Disease in your neck-of-the-woods, but in my area, my dogs got the Lyme's vaccine. Check your dog for ticks each rest stop & b/f turning in, especially if the dog is sleeping with you. However, having said that, a tick is much more at home on your dog (higher body temp), than you & prob. won't leave your dog to climb onto you - except for my son when he was young - more ticks got on him during a hike than on the dogs - i used to say that he was "magnetick" (sic) - ouch!!!
Nowadays, I would treat/filter their water IF i was treating/filtering mine. Food - i used a very dense, high quality kibble - the same stuff I used at home. if you change to a 'doggie' trail food, get them used to it at home - ask your vet about doing this. They will need more food on the trail however, than at home, since they will expend more energy on the trek. Let the dogs carry their own food. I would get them used to carrying some wt b/f you head out on the trek. In other words, get them in shape carrying their food on daily walks around your home.
have a great time with man's best friend.
ok...this post is gettin' a tad on the long side. 'nuff said.