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The OP is walking from Le Puy to Santiago via Irun, a journey of nearly 2,000km. It's rather more than any of the other examples raised here. Yes, two or three weeks on the Stevenson, or on four on the Camino Frances, might just be possible with a donkey. Doubtless there are yet more examples of...
Found it - Adosanes is in Benevant l'Abbaye. Here is a link: http://www.ânes.net/randonner_ane/Limousin.htm. I know it's not on the route you're looking at, but you might find some useful information. I'm sure there are other similar enterprises closer to the Le Puy route. Either way these are...
The pilgrim refuge Adosanes (along the Vezelay route but I forget exactly where now - perhaps someone can remember?) is attached to a donkey sanctuary - hence the name, 'behind the donkeys'. The owners told of trying to walk to Santiago with donkeys, but finding it was too far for the animals...
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