Agreed with the First Aid Kit suggestion. I always take a doggy boot as well. The main thing though is to ensure that your dog is really used to the type of walking you are requiring it to do. I have been on may LDPs with my dogs and have never had any problems, but then we trained for them together. They have also done the Lyke Wake walk with me too. I felt shattered at the end, especially after sitting down waiting for my B&B lift, whereas my dogs were still keen to go.
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Janice & Harlie(dog)