It shall be the duty of the state live stock sanitary commission to purchase from time to time, as may be necessary, a sufficient number of tags for the state of Michigan, which tags shall be purchased from such commission by the treasurers of the counties as the same may be needed to comply with the provisions of this act. Such tags shall be sold at cost to the said treasurers. The state treasurer is hereby authorized to advance to the said commission, out of any funds of the state, such sum of money as may be necessary from time to time to pay for the tags so purchased by the state live stock sanitary commission, which sum shall be repaid to the state treasurer from the money collected from the county treasurers in payment for the tags. The said commission is hereby authorized to extend 30 days’ credit to any county treasurer for tags so purchased. The commission shall also furnish to each county treasurer, on or before November fifteenth of each year, a book containing proper forms for issuing dog licenses required in his county, together with the necessary blanks for the use of the supervisors and assessors of such county; such books and blanks shall be furnished to said commission by the board of state auditors without cost to said commission. The tags required by this act shall be not more than 1 1/2 inches in length and uniform in shape throughout the state, the general shape of which shall be changed from year to year; such tags shall have impressed upon them the calendar year for which they are issued and shall bear the name of the county issuing them and shall be numbered consecutively.