Mochi is "good" in many ways, and at many things. Two of the things she is best at are the related games of take-away and keep-away. One of the highlights of her young life so far combined these games in the Barrington Dog Park.
I don't have video, or even photos, of that episode. So before describing it, I'll include a photo of an episode at home involving her stealing Thor's hammer, which is part of her human brother's Halloween costume.
Now, to the dog park, where Mochi has taken and kept away many things: water bottles, gloves,... and, recently, a Snickers bar that had fallen from someone's pocket. She proudly held the Snickers in her mouth, challenging the other dogs to take it from her. About half a dozen dogs took up the challenge and chased her. The chase went on for about 15 minutes.
The chasing dogs were soon joined by about half a dozen people. Perhaps they were afraid that Mochi or another dog would eat the Snickers and be poisoned by the chocolate. Thanks to those people, especially to the person who caught her.
She had not eaten the Snickers, having apparently decided that keep-away is more fun than Snickers-eating. By the way, I am reliably informed that the quantity and quality of chocolate in a Snickers would not be sufficient to hurt a dog of Mochi's size (48 pounds).
As for Thor's hammer, Mjolnir, it seems that Mochi is just about worthy to wield a plastic replica.