Socialisation does not end at puppyhood; maintaining adult dogs' social exposure and positive experiences prevents the fearfulness that develops with social isolation.
The common focus on puppy socialisation as the entire socialisation requirement misses the importance of maintaining adult social exposure. Dogs whose early socialisation was effective but whose adult experiences are socially restricted — through illness, owner lifestyle changes, or extended kennelling — can develop new fears that compromise welfare. Regular positive exposure to a variety of people, animals, and environments throughout adult life maintains the resilience that puppy socialisation establishes, preventing the fearfulness that develops in social isolation.