That butterwouldntmeltinmymouth look on their faces led me to believe that another dog was sneaking in and making the mess
Angus used to get shouder deep in the bin sometimes, so much so I could sneak in right up behind him without him hearing me. Then Yell REALLY LOUD “WHAT DO YOU THINK YOU’RE DOING?” and watch him leap back, bump into me, realise the bin lid is stuck on his shoulders, send the bin flying, try to run out of the kitchen only to find the gap between the dishwasher and the cooker is too narrow for the bin lid and only then as a desperate last resort try to look totally innocent as if the bin attacked him.
Thing is the look on his face as he realised that even his looks of innocence weren’t enough always cracks me into laughter so I can’t stay angry at him.