Thoroughbred and Cantering Foal Set #5393. Was also part of the Stablemates Horse & Foal 4 Piece Assortment #5390/W5390. Variations can include a sock on the back left leg.
Assortment set #5390 was on the 2019 Retired List, however, models were still pictured in the 2019/2020 and 2020/2021 catalogs.