Wash. Rev. Code § 16.57.243
(1) Cattle may not be moved or transported within Washington state without being accompanied by a certificate of permit, inspection certificate, self-inspection certificate meeting the requirements of RCW 16.57.160, or other satisfactory proof of ownership, except when the cattle are moved or transported:
[ 2010 c 66 s 9; 2003 c 326 s 28.]