[1] It is approximately 8 miles (14 km) long and drains the most southeastern portion of the Hood River watershed.
It arises at High Prairie Spring at 6200 ft (1890 m) elevation at the foot of Lookout Mountain (45°20′50″N 121°31′41″W / 45.3473°N 121.5281°W / 45.3473; -121.5281) and flows northward.
It joins with Dog River Springs at 5080 ft (1545 m) and continues surprisingly straight northward considering the mountainous terrain.
There are several half mile long zigzags north and west before turning straight northward again through steep mountainous forest.
The Dog River appears unsuitable for whitewater sports due to its low volume and restricted access for drinking water purposes.