My dog, Shadow, is smart as a whip, but she sheds like crazy.
One day Shadow brought me a tuft of her black fur. I thought, I wonder where she found that? But I rewarded her with a treat and put the fur in the trash.
Later, she traded a second clump of fur for a treat. When she brought me another one,
I realized it looked familiar.
Sure enough, there was no fur in the trash. Shadow was trading the same tuft for treats. She knew she was busted and innocently put her head on her paws and fell asleep.