Too many to mention, but a few highlights:
Mad spaniel I grew up with had a pet dead seagull that he carried about on his walk every day for a fortnight. He left it in the bushes every day then picked it up at the start of the walk. He rolled in it too.
Same dog found the inner core of a sweetcorn, (not even from our bin) ate it, threw up green grass and shite for a few days then had an emergency lifesaving operation - that's when we found that it was sweetcorn blocking his innards, and it doesn't dissolve.
Our first dog when we set up home together ate a packet of laxatives - to no evident effect - still don't understand that. She also got stuck in our bedroom as the door closed behind her. In an attempt to escape, she quite sensibly dug a hole in the mattress. This happened twice. Two different holes.
She also ate through a wall, exposing cables.
My aunt's dog, when growing up:
The dog was staying with us overnight. My Mum was steeping my Dad's socks in a basin on the floor, overnight. The dog picked out one of each pair of socks and snacked on them. So, five or six pairs ruined.
One of my dogs as an adult:
Got tore into a box of Thornton's chocolates from my boss, which was under the Christmas tree. Again, so evident adverse affect on him.
I loved all of these dogs, and all my other daft dogs.