Edna, my favorite (deceased ) designer, Ed Bye, A.E. Bye, was known for his horse farms – but more for the beauty than practicality – the horses had air conditioned stalls, 20×20, so you can imagine the type of horseflesh he designed for. the dry-laid retaining walls and stone drinking trough – gorgeous! Worth looking at – his picture book of his designs “Art into Landscape, Landscape into art” can still be found…..
For living designers, I know Eddie Hollander of Ed Hollander designs, in NYC, has done horse farms in the Hamptons….He’s not on Land8, but a really good guy..
Good Luck!