a small bag provided on request by a restaurant for a customer to carry home leftovers of a meal, ostensibly to feed a dog or other pet.
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British Dictionary definitions for doggy bag
a bag into which leftovers from a meal may be put and taken away, supposedly for the diner's dog
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012