Trialled:

1998

It's not easy being a dog in a big city. With master slaving at work all the time, poor Buster is lucky if he gets walked twice a day. Because of this, accidents happen. In 1998, some genius thought he'd found the solution with the "Portable Pet Potty". This earth-shattering invention was made from hermetically sealed polyethylene and was attached to your dog's derriere.