Set #300134 Austrian Riding School Backpack Play Set from 2008-2009, included the Leaping Lipizzan, Playful Arabian, Prancing Foal, Rearing Andalusian, Jump, 4 Flower Pots, 2 Standing Banners, 1 Trainer Doll, Shed, Play Mat and Riding School Backdrop. Released later in 2008, so not pictured in the catalog. This was on both the 2008 and 2009 Retired Lists.
This model is similar to the Set #300110 Chincoteague Island Beach Party Play Set, but this one may be more of a rose grey or heavily shaded flea-bit chestnut. Please contact me if you have photos you can share.