C-72.1, r. 4 - Rules respecting Standardbred horse races held at a professional race track

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47. A trainer who leaves the race track where the horses that he trains are participating in races may have a substitute trainer take his place, and the agreement of the substitute trainer to act in his place shall be transmitted to the racing judges.
The trainer shall be responsible for any horse that he declares in a race.
During the period of substitution, the substitute trainer shall be responsible for any horse that he declares after his agreement to replace the trainer has been transmitted to the racing judges. The 2 trainers may be held jointly responsible for the physical condition of the same horse.
Decision 90-09-19, s. 47.