Registration of docked horses—Within 90 days after this act shall take effect, every owner or user of any docked horse within this state shall register such docked horse or horses by filing in the office of the county clerk of the county in which such docked horse or horses may be kept, a certificate which shall contain the name or names of the owner or owners, together with his or their post office address, together with a full description of the color, age, size and the use made of such docked horse or horses, which certificate shall be signed by the owner or the owners, or his or their agent. The county clerk shall number such certificates consecutively and shall record the same in a book kept for that purpose, and shall receive as a fee for the recording of such certificate the sum of 50 cents: Provided, This section shall not apply to or make necessary the re-registration of docked horses which have been registered pursuant to Act No. 45 of the Public Acts of 1901, as amended, being sections 17080 to 17086 inclusive of the Compiled Laws of 1929.