In this episode, dogs are using their remarkable scenting skills for life-saving conservation and pro-active environmental policing. In Canada, a team of canine detectives is sniffing out the destructive invasive zebra mussel which is wreaking havoc on lakes and rivers across North America. In Washington, a Lagotto Romagnolo is unearthing a rare delicacy in the forests - a job once done by pigs. In South Africa, a pair of Belgian Malinois - are tracking down the critically endangered Geometric Tortoise in an urgent mission to save the species. Whilst in the waters off Washington State, an Australian Cattle dog - is using his scenting skills to find orca scat in the ocean to help scientists understand why the resident pods are on the verge of extinction. Director: Blake McGrow (2019)
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