These aren't Wubbas, Serena. The one they love the most is an unstuffed snake.
Belle and Cole with Mr Snake 3-4-10.jpg
Cole (in the Dreaded Elizabethan Collar) has Mr Snake by the head and Belle is trying to save Mr Snake by pulling him out of harm's way by the tail.
The first design had one flaw--eyeballs stuffed with cotton batting. Since then the Kong company has eliminated the puffy eyes by embroidering them on, instead.
And they are very durable toys! The Pack luvs 'em!