There was also a spike in the criminal class of dogs

Belgium once tried using cats to deliver mail.

In the 1870s, the town of Liège came up with the idea of employing 37 cats as their new mail couriers. The mail was loaded into waterproof bags that were tied around the kitties’ little collars and they were sent to their destination. However, this was quickly dropped as the cats proved slower and more unreliable than human post couriers.

Who knew.