A pack goat is a goat used as a beast of burden, for packing cargo. Generally, large wether (castrated buck) goats are used for packing, though does may also be packed. While does are generally smaller and therefore able to carry somewhat less cargo, they may also provide fresh milk. Goats are domesticated herd animals. They will usually stay near camp and follow their human masters on the trail, much as dogs will, without having to be leashed or tethered. They are generally used in wilderness camping settings.