It was "domestication", not just "suitable for herding": https://en.wikipedia.org/wiki/Guns%2C_Germs%2C_and_Steel#Agriculture https://en.wikipedia.org/wiki/Guns

It was "domestication", not just "suitable for herding": https://en.wikipedia.org/wiki/Guns%2C_Germs%2C_and_Steel#Agriculture https://en.wikipedia.org/wiki/Guns%2C_Germs%2C_and_Steel#Agr... "Diamond identifies a mere 14 domesticated large mammal species worldwide. The five most useful (cow, horse, sheep, goat, and pig) are all descendants of species endemic to Eurasia. Of the remaining nine, only two (the llama and alpaca both of South America) are indigenous to a land outside the temperate region of Eurasia." "Smaller domesticable animals such as dogs, cats, chickens, and guinea pigs may be valuable in various ways to an agricultural society, but will not be adequate in themselves to sustain large-scale agrarian society."