(2) Killing wildlife causing damage or killing wildlife to prevent private property damage.
(a) An individual (one) big game animal may be killed during the physical act of attacking livestock or pets.
(b) Predatory birds (as defined in RCW 77.08.010(39)), unclassified wildlife, and eastern gray squirrels may be killed with the express permission of the property owner at any time, to prevent private property damage on private real property.
(c) Subject to subsection (6) of this section, the following list of wildlife species may be killed with the express permission of the owner, when causing damage to private property: Raccoon, fox, bobcat, beaver, muskrat, mink, river otter, weasel, hare, and cottontail rabbits.
(d) The department may make agreements with landowners to prevent private property damage by wildlife. The agreements may include special hunting season permits such as: Landowner damage prevention permits, spring black bear hunting permits, permits issued through the landowner hunting permit program, kill permits, and Master Hunter permits.
(e) Landowners are encouraged to allow general season hunters during established hunting seasons on their property to help minimize damage potential and concerns.
(3) Wildlife control operators may assist property owners under the conditions of their permit, as established in WAC 232-36-060 and 232-36-065.
(4) Tribal members may assist property owners under the conditions of valid comanagement agreements between tribes and the department. Tribes must be in compliance with the agreements including, but not limited to, adhering to reporting requirements and harvest restrictions.
(5) Hunting licenses and tags are not required to kill wildlife under this section, unless the killing is pursuant to subsections (2)(c) and (d) of this section. Tribal members operating under subsection (4) of this section are required to meet tribal hunting license, tag, and permit requirements.
Out of curiousity, I looked it up. You guys can do what you want, me I think I'd make sure I had a license and tag unless a WDFW officer specifically told me I didn't need one.