Yea I can only really speculate with dogs, but they just arent evolved for long distance running. Even in cold weather they are designed to retain heat with a nice thick fur and survive the cold. Other than panting they really cant do much to cool off. I suspect that while the cold might somewhat extend their running range int he end they would still overheat long before we would.
It really is two factors. One is the inability to sweat, the other is mechanical, humans have more "slow twitch" fibers than any animal, 3x the ratio of a chimp, and a mechanical advantage geared to favor distance over strength. So even if we put aside the inability to sweat their muscles were be very inefficient at long distance running and would tire out in no time. As you point out they can barely keep up with a fast paced hike over the course of a whole day, they certainly cant run at top speed for hours on end in even the best of conditions.
@roboneko Excellent point, I stand corrected, maybe they can keep up with us if they "train"
@roboneko aside from being the extreme example of the species I suspect they could only do this in extremely cold weather. Probably not possible in a more normal climate
Yea humans can outrun the vast majority of mamals on foot in terms of long-distances. In fact there are a few modern humans who hunt this way, just just hunt deer with knives by running after them until the deer tires then they jump on it and slit their throat... amazing really, and sad.
@valleyforge
Depends largely on criteria. In a ~30 mile marathon run a extremely fit human would beat even a horse. However an ostrich would beat a human by covering that same distance in half the time.
That said I'm not sure how an ostritch would fair if we were talking, say, running from california to new york which would take many days to do. Make the distance long enough and maybe we could outperform an ostreich, I'm not really sure.
But point is aside from the ostreich there are very few, if any, animals that could keep up with us long distance. I am not sure about dogs but I kinda doubt even they could keep up with us over long enough distances. The reason the ostreich can do it is because its a bird and birds are extremely optimizes for weight, so even though they dont have some of our advantages like sweating that weight optimization makes up for it. But dogs being relatively heavy for their size and not being able to sweat would almost certainly make it impossible for them to keep up with us long term. According to the science our ability to sweat is ultimately why we can outcompete almost any other animal on the planet.
@Science