Squirrely-Jo carries the milk rings, too. However, S-Jo CRIES as she carries it up and down the hallway! As soon as she sees you looking at her, she'll drop it and run up to you with a glad cry so you can pet her. Then she runs back to "attack" it so you can see what a good 'hunter' she is.
I know I've got a TON of milk rings under my stove and fridge...because we just moved the entertainment center and found about 60 old milk rings underneath!