What type of dog is best for what I want?

I am looking for a dog I can take out into the hills with me on long walks with overnight stops in tents/bothies. I'd love a collie but they possibly require to much and can be very unforgiving of any training errors. I want to spend time training whichever breed I get to a decent level so it needs to be... show more I am looking for a dog I can take out into the hills with me on long walks with overnight stops in tents/bothies. I'd love a collie but they possibly require to much and can be very unforgiving of any training errors. I want to spend time training whichever breed I get to a decent level so it needs to be intelligent. Medium size and naturally friendly and loyal. So in summary: fit, intelligent, loyal and friendly, any ideas?
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