Sheep — blind obedience, groupthink, fear of standing out. Classic followers.
Goats — chaotic, stubborn, impulsive. Ideal for a society that thinks it's free but is actually just unruly within tight boundaries.
Cows — docile, content, slow-moving. Perfect metaphor for a sedated population lulled into compliance with comfort and routine.
Mixing them gives you a rich tapestry for satire: a world where the ruling class thinks it's wise but drools while watching moo-approved media, and the rebels are secretly trying to read.