Almost every night, something keeps dumping over my big trash can outdoors. I keep watching for animals but the way its propped up on a board, I don't see how an animal can do it.
I HATE when that happens. In my case it was a dog, I caught him on camera! Maybe you should invest in a security cam?
I was thinking of that because having to clean up the mess every time is ridiculous! I've already tried repellents but only natural ones since I don't like spraying chemicals.  I will have to price out some cameras.
I hear if you sprinkle red pepper all over your trash area it can help ward off some animals.