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According to Chewboom, Shake Shack is celebrating International Dog Day (August 26) in the BEST WAY! When you order your pup a Pooch-ini you'll get a FREE scoop of custard! Shake Shack is honoring this deal from August 26-28, and you can use this deal in store or via the app using code: DOGDAY2022. Shake Shack's Pooch-ini is made of Shake Shack's vanilla custard and their burger dog biscuits!