The notice on the lift door does not make it law
A Bengaluru apartment complex posted a circular last year banning all dogs above 10 kg from common areas. Residents who ignored it received written warnings. The warnings cited "society bye-laws" as authority. Those bye-laws had no legal standing to override what the Animal Welfare Board of India and successive court orders have already settled: a housing society cannot prohibit a resident from keeping a pet dog inside their own flat.
