S1·E51 Darby, Solo Sleuth

A cold is going around the Hundred Acre Wood and Kanga needs lemons to add to a special soup she's making to ease everyone's sniffles. When Pooh and Tigger catch the cold, Darby and Buster are left to sleuth out how to get some lemons themselves. Rabbit was supposed to deliver them, but it seems he's feeling under the weather himself, so the girl and her dog find themselves searching all over the Hundred Acre Wood to get lemons.