The 20-year-old horse was retired from stud duties in January 2020 due to a progressive lung disease, and now two and a half years later, the decision was made to euthanise the horse as his conditions deteriorated over the past few days.
Not A Single Doubt, a son of another champion stallion Redoute's Choice, sired 16 Group 1 winners throughout his time at stud, with another 79 stakes winners among his progeny.
“He carved out an exceptional stud career on sheer merit and we are incredibly proud of him, and everything he has contributed to the Australian thoroughbred industry,” Arrowfield's Chairman John Messara said.
“I'm grateful to Ron Finemore who led his original ownership group and always believed in Not A Single Doubt, to all the breeders who supported him, and to the buyers, owners & trainers who backed his progeny, especially in those critical early years.
“And thank you to our stallion and veterinary staff for their devoted care of Not A Single Doubt, particularly since his retirement.”
While Not A Single Doubt will be remembered for his efforts in the breeding barn, he also had a successful career on the racetrack in just 10 starts.
Not A Single Doubt missed the spring as a three-year-old in 2004, but returned in the autumn the following year where he won the Listed Zeditave Stakes at Caulfield.