My aunt had a poorly trained retriever, and he would steal anything off you - your phone, paperwork, food, right out of your hand if he felt like it and then aggressively snarl at you all possessive over his prize. He had bitten a few people, but it was like he was daring you to take it from him. My aunt used to give him treats to make him drop it, saying she was giving him a better alternative to have instead... so he actually got rewarded for stealing, not dropping!
Anyway I went to her house for a belated birthday dinner and a "birthday" cake she had kindly bought for me. The cake was square, and cut into six pieces ready before dinner. There were four of us eating.
After dinner, aunt cleared the plates and went to get the already cut cake. She waited til we had finished to tell us through tears of laughter that there had been a "mishap" with the cake.
The dog had jumped up against the worktop and straight up swiped the front two pieces from the plate, leaving four. Presumably gobbing dog slobber all over the rest. She was laughing as if it was sooo funny that the dog had claimed the two spare pieces before my cousin could snaffle them, or, you know, I could take them home? Never mind that she knew as she served them to us, and knew we'd be like errr no thanks, I'll leave the cake, she should have just kept her mouth shut forever but was almost gleefully telling us. Still makes me feel sick years later.
ETA she plated the remaining cake and brought it into the dining room, hiding the evidence now she couldn't bring the whole cake with great fanfare.