More of the world's people consume goat milk than cow milk. Goats are hardy animals: They adapt well to heat and cold, productively forage and graze, require little space, and are inexpensive to keep. Since mature does (females) usually weigh between 120 and 135 pounds (dwarf breeds can weigh between 35 and 85 pounds), they're much easier to handle than hefty cows, which can weigh 1,000 pounds each.