Pickens is said to be a lifelong equestrian. She developed an interest in thoroughbred
flat racing and with Allen Paulson, she owned several race horses, including
U.S. Racing Hall of Fame inductee
Cigar. She traded Cigar to husband Allen for the filly,
Eliza, the 1992
Breeders' Cup Juvenile Fillies winner and that year's
Eclipse Award winner as
American Champion Two-Year-Old Filly. Pickens' other horses included
Fraise, who won the 1992
Breeders' Cup Turf;
Yokohama, winner of the 1997
Prix Foy at
Longchamp Racecourse; and
Rock Hard Ten, winner of the 2005
Santa Anita Handicap. Pickens and Jenny Craig owned
Rock and Roll who won the 1998
Pennsylvania Derby and ran in the
Kentucky Derby. Pickens also raced Miss Dominique, named for her daughter. After the settlement of Paulson's estate, Pickens no longer had
colors to race, At the same time, she took up equine welfare causes when
Old Friends Equine purchased Fraise and multiple Grade One winner
Ogygian from their Japanese owners and she paid the $65,000 to bring them back to retirement at the Old Friends facility in
Georgetown, Kentucky. but the Pickens worked for a more permanent solution by lobbying Congress to pass the American Horse Slaughter Prevention Act (AHSPA), which passed in the
United States House of Representatives, but not in the Senate (in 2015, the AHSPA was folded into the proposed Safeguard American Food Exports Act). In recognition of their efforts, in 2007 Madeleine and Boone Pickens received the Equine Advocates' Safe Home Equine Protection Award. Since "any willing buyer" included those that would send the horses to
slaughter in foreign countries, Pickens established "The National Wild Horse Foundation," to create a sanctuary for excess horses. On November 21, 2008, Pickens was named Person of the Week by
ABC News due to her announcement that she would adopt and maintain, with private funds, all 33,000 horses at the sanctuary. In January 2010, Pickens hired three helicopters to view and photograph a BLM horse gather, and at one point they flew across the flight path of other helicopters being used to herd animals, leading to the accusation she had interfered with the gather. depicted a Native American on a horse watching over several galloping horses. The day before the parade, the National Tribal Horse Coalition issued a news release objecting to the float for using "the symbolism of the North American Indians and horses to promote agendas in direct opposition to the tribes' position." Also in 2010, Pickens purchased property in
Elko County in northeast Nevada; the 14,000 acre Spruce Ranch in the remote
Goshute Valley for $2,570,000. Shortly afterwards, she purchased the Warm Creek Ranch on
Highway 93, adjacent to the northwest boundary of the 508,000 acre BLM
Spruce Mountain grazing allotment. In March 2011, the BLM put out invitations for Pickens and others who wished to provide lands to maintain horses for the BLM in "Eco_Sanctuaries" to submit proposals for evaluation. ''Saving America's Mustangs,'' the formerly named National Wild Horse Foundation to which Pickens had transferred title to the Spruce Ranch, submitted a proposal to maintain horses, that the BLM agreed to evaluate in April 2012. In August 2012, the BLM published the proposal in the Federal Register but in June 2014 the evaluation stalled after scoping found issues that have yet to be resolved. Although she has purchased several hundred horses at risk of slaughter and maintains them on the private lands of the ranches, in 2014 Saving America's Mustangs leased the Spruce Allotment grazing permit to the
Spruce Grazing Association that instead grazes cows. On December 21, 2017, the BLM announced it would be rounding up horses in the area of the Spruce allotment. On August 25, 2018, the BLM announced an emergency gather of 300 horses at Boone Spring within the allotment. ==Mustang Monument Eco-Resort==