Mount Reynolds Trail is a 6.3 mile moderately trafficked out and back trail located near Salt Lake City, UT that features a lake and is rated as difficult. The trail is primarily used for hiking, cross country skiing, and snowshoeing and is accessible from May until October.
cross country skiing
Reynolds Peak is the highest point on the short ridge which divides Butler Fork from Big Cottonwood Canyon. The peak lies a short distance to the west of Dog Lake, a popular summer hiking and mountain biking destination. The peak is easily accessible from Big Cottonwood on the south or Mill Creek Canyon on the north. During the summer hiking season Reynolds Peak makes for an easy non-technical hike which can be completed in a couple of hours or less, an ideal summit destination for casual hikers. In the winter the peak and surrounding area is a very popular destination for backcountry skiiers, and also makes an excellent objective for winter snowshoeing, particularly when avalanche danger might make attempts at larger nearby peaks ill-advised.
This might be an optimal way to hike Mt. Reynolds. To make a bit more of a loop, one could go up sticking with Big Water and down Little Water (the attached map shows down the first half of little water, than switching back to Big Water). These trails from the upper end of Mill Creek are very pretty, fairly easy (very well graded), shaded, and dogs are allowed. Technically your dog probably isn't allowed up Reynold's since it's in the Big Cottonwood drainage, but if your dog happens to follow you up, I doubt it would damage the SLC Watershed. Adding Reynold's to a Dog Lake hike is nice in that you get some views that you never really get on the way up to Dog Lake. Also, while that last section is steep, it's pretty short, so doesn't make for a difficult hike. Overall I would rate this as only moderate. There are numerous other ways to reach Reynold's - Mill D, Butler fork, Desolation, etc.