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I have to confess that I wouldn't have gotten it without the explanation, but it's pretty funny when you explain it.
One thing that might make it even funnier for you, is that in the US (at least on the West Coast, sometimes these phrases change from location to location), doggy bag is sometimes what we call the bag that we put our food that we couldn't finish when eating at a restaurant, to bring home later. It would be kinda funny for us to head over to your part of the world and ask for a doggy bag at a restaurant, after eating a meal. That might get a few strange looks, eh?
Imagine the other way around ... "Sir, you'd like to take a doggybag with you, in order to finish your meal at home ?"