George Stubbs – Whistlejacket Part 3 National Gallery UK

The picture has something of this: horse, cavalry, equine, mare, stallion, mammal, equestrian, seated, chestnut, mane, racehorse, animal, action energy, sorrel, farm, jump, portrait, mustang, two.
Perhaps it’s a painting of a brown horse galloping with its front legs in the air, with one leg.