Two witnesses see strange quadruped from truck near Moclips witnessed in Grays Harbor County, Washington

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My son and I were heading north on hiway 109 just north of Moclips, WA. We were in my pick-up truck and I was driving. It was cloudy, but no rain. The sun had just set but there was still plenty of light. 109 is a two lane road along the ocean and there wasn't any other traffic, so I was driving sort of slow and enjoying the nice summer evening. As I was driving, I was enjoying the view to my left and just caught a glimpse of a decent sized animal that darted from right to left across the road and into the left ditch, where I lost sight of it as I drove past. As I drove I continued to look to my left to take in the view when movement near the road ditch to the left side of my truck caught my attention. I turned my head to look out the driver's window and saw some sort of animal running on all fours in the ditch to the left beside the back of the truck about 25 feet away. It was easily keeping up with the truck as I drove about 35 mph. My mind couldn't identify what sort of animal i...