Leak Okeover, Rev. John Allen and Captain Chester at Okeover Hall, Staffordshire Arthur William Devis (1712-1787)

The picture has something of this: cavalry, mammal, seated, people, horse, herder, recreation, competition, group, wear, motion, equestrian, racehorse, man, farming, jockey, farm, dog, veil.
Perhaps it’s a painting of a group of people standing in a field with horses, dogs, and a house in the background with a dog in the foreground.