A dog on a trail looks like a dog in its element, nose down, pace quick, tail up. What that picture hides is that your dog has no concept of the return journey. It will keep moving long after its pads are raw, its water reserves low and its muscles spent, because you are moving and it will not leave you. That asymmetry is the central fact of trekking with a dog, and everything else follows from it.
What happens to paw pads on rough terrain
A dog's paw pads are tough but not invulnerable. On a flat park walk, the pad surface hardens over months of use. A trail introduces sharp gravel, loose shale, hot exposed rock and wet roots, surfaces the pad has never trained for, often in a single afternoon. The outer layer of the pad is keratinised skin, similar in structure to the heel of a human foot. It abrades. On a long descent over loose stone, a dog that started the day with healthy pads can finish it with pads that are cracked, tender and bleeding at the edges.
Check pads at every rest stop, not just at camp. Lift each paw, press gently on the central pad and between the toes. A flinch, a lick, or a visible raw patch means the dog is already past its threshold. Booties help some dogs on known terrain; most dogs on their first trek will spend ten minutes removing them. The more reliable approach is to condition pads over several weeks before the trek with progressively longer walks on varied surfaces, and to plan shorter days on day one and two regardless of how the dog looks.
If a pad tears open on the trail, clean it with water, cover it with a clean cloth or a cut-up bandage from your first aid kit, and assess whether the dog can bear weight. A dog that is three-legged on a mountain path needs to come down, not continue up. That is the turn-back call, and it is not negotiable.
Pacing: the dog follows you, which means you set the pace
Dogs regulate exertion poorly in comparison to humans because they do not sweat through their skin. They cool almost entirely through panting, which is effective within a range and fails outside it. A dog panting with its mouth wide, sides heaving and tongue fully extended is working hard to cool. A dog panting with a thickened, curled tongue and slowing its own pace is past the comfortable range.
On a trek, set your pace by the dog, not by your itinerary. Rest in shade every forty to fifty minutes. Offer water at every stop, not just when the dog signals thirst, because by the time a dog signals thirst it is already mildly dehydrated. Carry more water than you think you need for two. A working estimate for a medium-sized dog on a moderate trail in warm conditions is roughly half a litre per hour of active walking, though the actual figure varies with size, coat, temperature and gradient. Do not treat any estimate as a prescription; watch the dog and adjust.
Altitude is a separate variable. Dogs acclimatise to altitude, but they do not acclimatise instantly. A dog taken from a city at 300 metres to a trail at 3,000 metres in a day will be working against reduced oxygen on top of the physical load of the trail. Allow a rest day at intermediate altitude if the trek involves a significant gain. Signs of altitude stress in dogs, lethargy, loss of appetite, stumbling, look similar to exhaustion and heat stress. When in doubt, descend.
Reading the signs that say stop
The hardest part of trekking with a dog is that the dog will not stop voluntarily. The signs that mean turn back are not dramatic. They are: a dog that has gone quiet when it was vocal before; a dog that is lagging behind rather than pulling ahead; a dog that lies down at a rest stop and is reluctant to stand; a dog that stops drinking when water is offered; excessive panting that does not settle after ten minutes of shade and rest; a gait that has changed, shorter steps, a slight favouring of one side.
Any one of these is a reason to shorten the day. Two or more together is a reason to turn around. A dog that collapses, vomits, has pale or white gums, or is breathing in a way that looks laboured rather than simply fast needs to reach a vet as quickly as the terrain allows. On a remote trail that means beginning the descent immediately and arranging transport from the trailhead. There is no home management for heatstroke or collapse in the field.
What to carry and what to confirm before you go
Your pack for a dog trek includes: enough water for both of you with margin, a collapsible bowl, paw-check supplies (clean cloth, a small bandage roll), your dog's regular food for the number of days plus one, any medication your dog takes regularly, and your vet's contact number saved where you can reach it. A basic dog first aid kit, gauze, saline, a tick removal tool, is worth the weight on any overnight.
Before the trek, speak to your vet. A dog with a heart condition, a brachycephalic breed such as a Pug or French Bulldog, a dog that is very young, very old, or recovering from any illness is not a candidate for a strenuous multi-day trail. Your vet can tell you whether your specific dog is fit for the specific trek you have planned. No article can make that call for an animal it has never examined.
On logistics: trail rules, permit requirements, and whether dogs are permitted at all on a given route change. Confirm with the forest department or the trail authority before you book. Do not rely on what a forum post from two years ago says about the rules.
A dog that finishes a trek tired, well-fed and with intact pads has had a good day. The goal is not the summit. The goal is both of you walking back to the car.