Both my Yorkie and our Siamese mix cat hoard things under the sofa... Let me check.
A leg that was ripped off a small plush octopus toy. (That could have been the doing of either the dog or the cat.)
36 cents in change. (Definitely the cat's doing-- he likes shiny coins.)
My hand-held GPS receiver! (That had to have been the dog, since I doubt the cat could fit it in his mouth.)
A wrapper from a lollipop. (I haven't even bought lollipops recently! Where did THAT come from? Maybe Penny brought it home from a walk?)