The Buffalo is unlocked by reaching rank B with Westown. After which it can be purchased from Westown.
A buffalo should be either let out or given fodder in the bin daily so that they may graze, however do not let them out when it rains. Aside from that the buffalo should be pet and brushed daily.
There are five possible personalities for an animal, each having its own advantages.
||+5 to by-product yield
||+5 to by-product level
||+2 to coat
||+1 to friendship
||+1 to health