I've hiked my dog for HOURS before, she's 6 months old and has gone as far at 6 miles with a large elevation and in the snow- that being said I know my dog very well and I know when she is tired. They will all have there own limits. I never push her to do more then I think she can. Also I wouldn't hike your pup with any weight at all especially if you are going far, I learned that from the forum (I'm guilty of doing the same thing)
Have fun and take lots of pics!!
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