Restless Pups (Culture Pressure)
When a rival pack’s culture owns four of a city’s six neighbor yards, the pups inside get restless. One turn is whispering; two is a Confused Day where nothing gets done.
On the third pressured dawn the pups vote with their paws and join the neighbors — nobody is hurt, the flag simply changes.
A garrisoned city grumbles forever but never flips, and a capital never wavers. Grow your border cities’ culture, or post a guard pup.