Goats have most of the same advantages of the lama except for size and thus can't carry as much weight. However, it is more practical to have a larger herd and thus be able to distribute a load over many more animals. The primary advantage of using goats, for me, is that once bonded to you they will follow you where ever you go - a big advantage when one must be traveling on foot and directing one's attention to other things such as looking for plants, game, and humans. They will eat anything and being smaller than the lama require less food be provided for them when not on the move. The major disadvantage when traveling is the increased likelihood that they could be noisy, thus giving away your location when trying to avoid any undesirable folks you may run across.
Offered by Ron.