The Littlest Pet Shop Series 2 toy line the pets eyes changed to glassy polishing rather than matte style in Series 1. These pets have symbols in their eyes that meant something, such as a snowflake (chilliest), cookie with a bite (hungriest), raindrop (sportiest), flower (cuddliest), and a wind symbol on some Comic Con-exclusive pets.
They also come in brighter colors. Latest ones (2007) don’t have a magnet but a hexagon hole (except for birds with a rectangular one). C-031 marking showed up (except for on birds).