Our 2 Great Pyrenees are too old and lazy (they're not known for their endurance anyway ), but our little terrier mutt might work.
Anyway, we've decided that future dogs will need to be able to go with us on trail rides. Maybe a Lab or a Weimeraner.
What breed is your dog that you take with you? What problems do you have with them on the trail? Do they run other dogs off (that's kinda what we'd like since some of the dogs in our area can be irritating to ride around) or do they attract them even more?