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When US service men and women end their tours of duty and return home, their military dogs do not always follow. The American Humane Association says this needs to change. Dr Robin Ganzer, the organisation’s president, explains how it is that some dogs get left behind. (Photo: A US Marine relaxes with his sniffer dog corporal 'Books' in Helmand province Afghanistan. Credit: CHRISTOPHE SIMON/AFP/Getty Images)