I started off on this normally over-populated trail around 9:30 am and was surprised to find the parking lot empty except for 2 other cars, of whose drivers were finishing their hike right as I started my own. Dog Mountain all to myself! This would normally be great but it was much more windy than usual (it's usually windy up there but this was ridiculous), a little too cool for comfort and kind of dark. The result was a slightly creepy hike: Roaring wind rubbing branches together like something out of a horror film, snakes of cloudy mist blowing through the tree line, snapping twigs, etc. It was both exhilarating and spooky. The hike to the first lookout was glorious. Great sweeping panorama of wild windswept mountainsides and a very white-capped Columbia River. Almost lost my hat to the wind several times.
About 15 minutes past the first lookout I stopped hiking and turned back before summiting. I normally hate to not finish a hike but I was pretty much walking in a thick, grey, cold cloudbank at this point and couldn't see anything. The way the wind was blowing the clouds in it looked like it was just going to get cloudier and darker. And as a single female hiker I wasn't going to take any chances. I got creeped out and high-tailed it out of there, sure that every snapping twig was a bear or cougar coming after me! Pretty soon I ran into an older couple climbing the trail and felt better, but I called it a day nonetheless.
I'm surprised that other reviewers think this is an arduous hike. It's steep and tedious at times but fairly easy for a Washington hike with lots of moderate climbing and rolling trails. I've been on this trail on two other occasions when it was HOT and clear skies, and definitely recommend this hike.