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Dogs are not allowed on trains or buses in Spain.
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I've just seen your other post about taking a dog on the Camino de Santiago. Please do not do it. It is cruel to the dog who has no choice in the matter, and quite unnatural to expect a dog to walk that distance. I've seen some dogs on the Camino, and all have ended up with sore worn feet, leg injuries etc.
There are many farm and village dogs on the Camino who will not take kindly to a strange dog walking through their territory. Your dog will be constantly on the alert and nervous, not a good thing for the animal. While you might be having a nice hike, the dog will not!
You will also have work out how to get the dog back to your home country. Plus perhaps the added problem of being stranded if your dog decides to stop walking! In addition, are you prepared to carry equipment for both yourself and the dog: food, tent, water bowl etc, because you will not be allowed to stay in the Albergues or hotels or take the dog into cafes/bars etc.
If you insist on taking the dog get it used to walking long distances every day and get special shoes to protect the dog's pads.