"Persistence hunting is a type of hunting where the predator uses a combination of running and tracking to pursue the prey to exhaustion. Nowadays it is very rare among humans hunting animals, but it is seen in a few Kalahari bushmen and the Tarahumara or Raramuri people of Northern Mexico. It has been thought to be one of the earliest forms of human hunting.
"Persistence hunting requires endurance running - running many miles for extended periods of time. Among primates endurance running is only seen in humans and is thought to have evolved 2 million years ago."
http://en.wikipedia.org/wiki/Persistence_hunting
Why didn’t we just start sweating more through our tongues like dogs?
Evolution seeks to explain why what happened, happened, not why what didn't happen, didn't happen.
And so there was enough persistence hunting to cause humans to lose most of their hair?
And then, miles from home, when the kill is made, the hunter does what with it? Schlep it all the way back home?
Persistence hunting may happen on occasion, but I would have serious doubts that it was widely practiced enough to cause it to influence human genetics simply because it’s extremely impractical when there are other sources of food nearby that are much easier to kill and bring home.