My Dog is a Kleptomaniac

So we finally bought a dog last week, keeping a promise we made to Emmy a long time ago. She's a 4-month old Yorkie who alternates being full of energy and napping contentedly in someone's lap. She's also a kleptomaniac; she's got this odd habit of putting stuff in her cage. Like a squirrel who can't store enough nuts, she hides anything she can bite: squeaky toys, rawhide bones, Hot Wheels cars, her collar (when it's off her), her leash, a spare straw, whatever.