10. Yorkshire Terrier
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The silky Yorkies we know today were originally bred as ratters. Weavers and miners used them as natural exterminators to keep their workplaces rat-free, and their smaller size makes it easy for them to chase and kill rats even in tiny spaces.
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In WWII, a Yorkie named Smoky helped American soldiers string communication wires beneath a Japanese airstrip, saving the soldiers from having to face enemy fire.
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