For reasons that really shouldn't have to be explained, you're not really supposed to bring pets into Walmart stores. A combination of live animals and fresh food is asking for trouble, and even a well-behaved dog would be tempted by the contents of the shelves in the meat aisle. Exceptions might be granted in the case of seeing-eye dogs for the blind, but we're not aware of any cause that would permit someone being allowed to roam around the store tightly clutching their pet ferret.
After staring at this picture for longer than we'd like to admit, we've come up with one possible explanation. If this man goes outside holding onto a ferret, everyone is distracted by his pet, and so nobody pays any attention to his obvious wig. As a distraction tactic, that's next level, and so we ought to stand up and applaud him. We'd still rather there wasn't a chance of a ferret breaking loose and skittering around the aisles while we're shopping, all the same.