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29 Things You Didn't Know About Labrador Retrievers, America's Most Popular Dog

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18. They Used To Be Military Equipment
Dogs have long been utilized during wars, but they weren't always treated with the same respect they are today. During the Vietnam War, combat dogs were classified as “expendable equipment", so when the troops left the country, they were ordered to either euthanize or leave behind the dogs. 

This law changed in 2000 when former President Bill Clinton signed a bill enabling combat dogs to be adopted after their tours.