Trainer Gai Waterhouse has been fined $5500 after being found guilty of two charges relating to the condition and treatment of More Joyous.
Racing NSW stewards found Waterhouse should have reported the mare's soreness in the neck and her treatment with an antibiotic in the lead-up to the All Aged Stakes on April 27.
More Joyous finished second-last as one of the favoured runners in the Group One race.
Her owner John Singleton then publicly sacked Waterhouse, sparking an inquiry into the horse's condition.
Waterhouse's fine is in two parts - $500 for not keeping up-to-date records and $5000 on the more serious charge of not reporting her condition.