My lab does the grocery bag trick. In fact he practically knocks me over every time I come home because he insists on carrying something-my purse, a water bottle, an empty coffee cup...anything. He also collects the newspaper from the end of the driveway, brings the mail to the front door and drags the garbage can and recycle boxes back to the house. All that and he cleans up chicken
too 
..these are great.... 
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Pet quality wheaten/blue wheaten ameraucanas, welsummers, barred rocks, light brown leghorns; Projects on the go: rhodebars, welbars