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Buying watch dog can help with home security

A group of Chihuahua dogs, Traviata, left, Iago, front, Aida, right, and Gioconda, behind center, run together along the Charles River, in Boston, escorted by their owner Domenico Mastrototaro, of Boston, not shown, Monday, Aug. 1, 2011. All the Chihuahuas are named after operas with the exception of Iago. (AP Photo/Steven Senne)