Oguri Cap

Oguri Cap was a grey stallion foaled on March 27, 1985.^[1] His sire Dancing Cap was an American-bred racehorse who had five wins out of 19 starts in the United Kingdom alongside one second place finish in France.^[3] Oguri Cap's grandsire Native Dancer was a highly successful American champion racehorse and sire, and is a National Museum of Racing Hall of Fame inductee.^[4][5] He is considered to be "all but universal in North American pedigrees".^[6] Dancing Cap and Oguri Cap's dam White Narubi were descendants of Nasrullah and undefeated Italian racehorse Nearco.^[4] Both horses are among the most influential sires of the 20th century.

He was bred by Funao Inaba on the small and family-owned Inaba Farm in Hokkaido, Japan.^[7] When he was foaled, he was unable to stand up whereas healthy newborns should be capable of standing on their own within one hour.^[8] This was due to his front left leg being considerably bowed outwards. The farm's staff had to hold Oguri Cap up in order for him to be breastfed.^[9] However, White Narubi sometimes refused to breastfeed him and did not produce an adequate amount of milk. Oguri Cap ended up developing a massive appetite for what food he could find including weeds. Due to this abnormal diet and lack of milk, he was thin and unappealing as a foal.^[10]

In the hopes of him growing up healthily, Inaba named the foal "Hatsuratsu" meaning "lively" or "vigorous". He eventually successfully remedied Oguri Cap's bowed leg with hoof trimming.^[11] By the end of his second year, Oguri Cap had grown into a healthy, fully capable horse.^[10]

Oguri Cap had a major impact on the Japanese horse-racing scene, thanks in no small part to his humble beginnings.

Due to starting his career in regional races, his move to the National scene came too late for him to be registered for the 1988 season of the Japanese Classic races, specifically the Satsuki Shō, the Tōkyō Yūshun (Japanese Derby) and the Kikuka Shō, collectively called the "Japanese Triple Crown". However, as Oguri Cap continued to win race after race, there was a popular outcry to allow him to participate in the classics despite missing the deadline. While the Japan Racing Association (JRA) stood firm against allowing Oguri to participate, they did soon after change their rules to be less strict on registration, allowing late entries and even foreign-born horses to run in the classics, though with a hefty fee attached.^[12] Two of the beneficiaries of this new rule were fellow JRA Hall of Fame inductees T. M. Opera O and Kitasan Black.^[2][13]

Oguri Cap was extremely popular with fans, earning the nickname "Idol Horse", thanks to drawing crowds who watched the races for more than just race-betting, and was one of the first racehorses to have plush dolls made in his image, a form of merchandise that is now commonplace.^[12]

In May 1987, Oguri Cap made his debut at Kasamatsu Racecourse in Gifu Prefecture. After winning 9 starts in 11 races, including 7 consecutive victories and 4 stakes wins, he was transferred to the ownership of Chuo Horse Racing in January 1988. He recorded 13 more wins, including 4 Grade I stakes, 4 Grade II stakes, and 4 Grade III stakes. Some of his biggest wins included the 1989 Mile Championship (GI), two-time wins in the Arima Kinen (Grand Prix) (GI), and a win in the 1990 Yasuda Kinen (GI). He also won the New Zealand Trophy (GII), the Takamatsunomiya Hai (GII) and won the Mainichi Ōkan (GII) twice.

Oguri Cap was known for his rivalry with fellow gray-haired horse of the year Tamamo Cross, with whom he fought three times at the 1988 Tenno Sho (Autumn), Japan Cup, and Arima Kinen.

In total, Oguri Cap raced 32 races in his career, with 22 wins and 4 Grade I victories.^[14][15]

After retirement in 1991, Oguri Cap was sent to the Yushun Stallion Station to stand stud. He was not able to produce any racers of his caliber, and in 2007 he was retired from stud duty. After retirement, he lived as a pensioned stallion at the Yushun Stallion Station. On July 3, 2010, he fractured one of the tibias in his legs in an apparent pasture accident, and was subsequently euthanized.^[48]

In 1988, Oguri Cap won the JRA Award for Best Three-Year-Old Colt and won the JRA Special Award the following year. In 1990, he won both the JRA Award for Best Older Male Horse and Japanese Horse of the Year. He was inducted into the JRA Hall of Fame in 1991.^[49]

He was nicknamed "Oguri" and for his performance, he was also nicknamed the "Gray-Haired Monster".

A life-sized statue of Oguri Cap was erected at the Yushun Memorial Park in Niikappu, Hokkaido one year after the horse's death.^[50][51]

In addition, another Oguri Cap statue was erected at Kasamatsu Racecourse and later refreshed in 2019.^[52] Alongside the statue, Oguri Cap's mane is also on display there.^[53]

An anthropomorphized version of Oguri Cap appears in the Umamusume: Pretty Derby franchise. Voiced by Tomoyo Takayanagi, Oguri is depicted as an introverted, simple minded ashen-haired girl with a large appetite, often being seen eating comically large portions of food.^[54][55]

Originally appearing as a minor character in the anime and a playable character in the game itself, Oguri Cap's real-life career would later be dramatized in Umamusume's spin-off manga series Uma Musume Cinderella Gray. Produced by Junnosuke Itō, written by Masafumi Sugiura and illustrated by Taiyō Kuzumi, Cinderella Gray began serializing in Shueisha's Weekly Young Jump on June 11, 2020 with the first collected tankōbon volume published on January 19, 2021.^[56][57] As of September 2025^[update], twenty-one volumes have been released.^[58] The manga concluded on December 25, 2025.

Cinderella Grey received an anime adaptation in 2025, airing in two split cours.^[59] The first season, focused on Oguri Cap's debut at the Kasamatsu racecourse in 1987 to the 1988 Autumn Tenno Sho, aired from April 6 to June 29, 2025 with the second cour airing from on October 5, 2025 to December 21, 2025.^[60]

In the manga and anime series Nichijou, the character Mai Minakami owns a dog named Oguri Cap.^[61]

Through Never Say Die, Oguri Cap was a descendant of War Admiral and Man o' War and through Nasrullah, he was a descendant of Nearco.

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