52. In order to participate in a race, a horse shall:(1) have been tattooed according to the standards of the Standardbred Canada or the United States Trotting Association;
(2) hold an eligibility certificate and a registration certificate;
(3) be at least 2 years old and, in the case of a race held at a professional race track, not more than 14 years old;
(4) not have undergone nerve blocking by physical or chemical means other than in the posterior digital nerves; any nerve blocking that has been done must not have been at a level higher than the pastern;
(5) breathe without the help of a tube;
(6) not be blind;
(7) belong to an owner;
(8) satisfy the other conditions or requirements prescribed in these Rules.