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What is ironic about Meursault's observation that "[Salamano and his dog] haven't changed their route in eight years…It's the same thing everyday…This has been going on for eight years"?
Before getting the dog, Salamano used to act spontaneously and unpredictably.
Meursault himself lives a life almost completely governed by routine.
Meursault seems to have had a similar sort of routine with his mother.
Salamano and his dog genuinely enjoy their walks together.
Meursault unknowingly longs for the sort of routine Salamano and his dog follow.