Skamania County Emergency Medical Services responded to three calls at the Dog Mountain Trail over the weekend.  On Saturday evening crews were dispatched up the Dog Mountain Trail for a hiker with a medical condition.  The adult male received medical intervention and was able to trek the remaining portion of the trail.  Sunday afternoon crews were again dispatched for an injured hiker at the top of the Dog Mountain Trail.  Moments later crews were also dispatched to a motor vehicle collision at milepost 54 on Highway 14 just next to the Dog Mountain parking lot and trail head.  Crews responded with multiple apparatus and assisted the 5 occup nts from the three car collision.  All occupants were evaluated and treated by medical personnel for minor injuries and released.   Crew members then began up the trail to assist the hiker, an adult female.  A helicopter transferred the patient to awaiting crews at Home Valley Park and the patient was transported to PeaceHealth Southwest by ambulance for an ankle injury.