Faux Falls is a small desert waterfall located in Spanish Valley just outside of Moab. It's easily accessible from the Ken's Lake Campground. There's a pool of water at the bottom of the falls that dogs can splash round and cool off in.
You can hike up from Ken's Lake via the trail linked on AllTrails, or you can drive up closer to the falls. There's an overlook area (where the picture for this activity was taken) or you can park a bit further up the road and walk to the falls. Be sure to stay on existing trails to avoid busting the crust!