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I, too, am afraid of unleashed dogs on the camino. A trick I found very effective is to spread out your arms holding your trekking poles - guaranteed to silence any barking dogs, at least long enough for you to get away.
Imagine how quickly your "weighing nothing" stones can pile up over the years. Nonetheless, I think your idea of a stone "exchange" does have merits -- if the stone is picked out of the same pile.
Oh, one more thing - I make a point of stopping every hour or so to remove my boots and dry my socks. Not enough can be said about keeping those feet dry to prevent blisters.
I would recommend zig-zag your way on slopes. Admittedly, this doesn't seem natural to us citydwellers. By walking diagonally across, instead of straight up or down, one could reduce the gradient by up to one-third! So, for example, a 45-deg slope would appear to be just 30 deg by zig-zagging...
Here's what I did on my two previous caminos:
1) I 'trained' on the spot, meaning, I started slow and gradually worked my way up. So, for example, I'll do 10 km on day 1 or 2, 15 km on day 3 or 4, and so on. You will soon reach your own pace that way. Remember, if you are out of breath, slow...
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