Must-see: Adorable photo of Boston puppy in oversized K-9 vest goes viral

The puppy, named Tuco, according to Boston Magazine, is 9 weeks old and being trained by Patrol Officer Troy Caisey, the head trainer of the Boston Police Department's K-9 unit. 

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Massachusetts Vest-A-Dog is a nonprofit organization that has provided the Boston police K-9 unit with first aid kits and 26 vests since 2000. 

The photo was posted to Facebook on Sunday as part of fundraising and awareness about a Massachusetts police dog calendar.

Read the full story here.

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