Conn. Agencies Regs. § 12-574-A17
(k) Scratched or excused horses. Should any horse entered in a quinella race be scratched or excused by the stewards after wagering has commenced or should any horse be prevented from racing because of the failure of the stall doors or the starting gate to open, all tickets including such horse shall be deducted from the quinella pool and money refunded to the purchasers of tickets on the horse so excused or prevented from racing, upon surrender of said tickets.
(l) Determination of winners. In the event no ticket is sold on the combination of the first two horses in the official placing, then the next horse or horses, in case of dead heats, in the order of official placing shall be included in the winning combination. In the event of a dead heat for second position and no ticket is sold on one of the horses involved, in the dead heat combined with the winner, the entire pool shall be paid to holders of tickets which combine the winner with the other horse in the dead heat.