MK Quarter Horses is a full-service equine facility in Wilson, New York, started in 2004 by Melissa Koser. The operation has grown from two horses and a rented space to over 65 horses on a purchased property. Services include three boarding options, lessons in all disciplines, training from start to finish, AQHA and TB stallion breeding, sales, and local to international transportation.

MK Quarter Horses' main barn features radiant floor heating, large matted stalls with Nelson automatic waterers, a hot/cold wash rack, two grooming areas, and a heated tack room with a large insulated indoor arena. A second barn built in 2016 adds 16 additional 10x12 matted stalls with four tack areas. Pasture board, mare care, and foaling services are also available.