(1) Except as provided in section 18(1), no person may perform any significant surgical procedure on an animal unless that person is—
(a) a veterinarian; or
(b) a person who is acting under the direct supervision of a veterinarian and who is being taught veterinary science at undergraduate level.
(2) A veterinarian who, for the purpose of teaching veterinary science, supervises the performance of a significant surgical procedure, must be present throughout the performance of that surgical procedure.
(3) Any person may, subject to subsection (4) and to Parts 2 and 6, perform on an animal any surgical procedure that is not a significant surgical procedure.
(4) No person may, in performing on an animal a surgical procedure that is not a significant surgical procedure, perform that surgical procedure in such a manner that the animal suffers unreasonable or unnecessary pain or distress.