Whoever shall be lawfully convicted of wilfully and knowingly marking, branding or disfiguring any sheep, goat or hog of any other person shall, for each and every sheep, goat or hog which he shall be convicted of marking, branding or disfiguring as aforesaid, be subject to a penalty of twenty-five dollars or to imprisonment for a term not exceeding twenty days. In case such offender shall afterwards repeat the same or commit a like offense, on conviction thereof he shall be liable to a fine of fifty dollars or to imprisonment for a term not exceeding thirty days for each and every sheep, goat or hog by him so marked, branded or disfigured.