He couldn't hack it as a drug-sniffing dog. Now he's conservation's best friendBy Michelle Lou and Brandon Griggs, CNNUpdated 1:07 PM ET, Tue March 12, 2019 Chat with us in Facebook Messenger. Find out what's happening in the world as it unfolds.Train, a Chesapeake Bay retriever, sniffs out the poop of elusive animals like jaguars and mountain lions. (CNN)Let's face it: All dogs like to smell poop. But this dog smells something else, too -- opportunity.