As they say, Bob Knows! The only thing I would add is that through living for generations with shoes, we have lost the knowledge of how to look after bare feet, what to do when we get callouses or cracks. Generally we don’t want to develop callouses, as these are liable to cracking which are painful and can be difficult to sort. With the leathery skin on the sole of the foot, we also develop fatty pads with cushioning and insulating value.
I wouldn’t say we are quite as capable as dogs, at least, not in cool climates, as we aren’t well evolved for freezing conditions. I can manage down to about minus 4C, but that involves keeping moving and generally wearing warm clothes, although I will run naked in that temperature in calm, sunny conditions.
I walk and run landing on my forefoot, although at some times on flatter surfaces more midfoot. Forefoot landing is particularly important in rougher conditions. As the wide forefoot lands, with the benefit of all those nerves, it can respond to the underfoot conditions, stones etc. Larger stones and rocks we can see well enough ahead to avoid or take in our stride, although this is a skill which comes with practice.
A midfoot landing on rough rocky surface can result in very painful rocks in the sensitive midfoot section. I know! I still have a bit of a lump from my regular run when I managed to land on several rocks with my right midfoot in a short period. My natural tendency when being more cautious was to run more midfoot with my right foot, resulting in the extra hits. Now, I know that being cautious on such surfaces means letting the legs bounce, with plenty of vertical movement, letting the foot hang and land ‘gazelle’ (that’s how it feels to me)like on the forefoot. If there is a rock then in the midfoot section, you feel and react before any damage is done.
That was quite a lot more - although I’m not sure how useful....