He’s on the Lookout
Yet another IKEA bag/dog carrier. It looks like this woman not only put her dog in the bag, but she also explained to him the whole situation. Why he needs to suddenly be in a bag, what the new rule is, what the repercussions are if they get caught without a carrier, and finally, that he needs to be on the lookout for the subway officials.
Source: sadanduseless.com