San Juan Loop Trail is an easy, 2 mile hike in Cleveland National Forest that will take about 1 hour to complete with Fido. This short trail offers beautiful scenery and attracts crowds accordingly. This is one of the most used trails in the Santa Ana Mountains and is suitable for all types of people.
We recently took our chihuahua/Min Pin mix on this trail and she had a blast. The trails are a bit narrow and rocky in some places but we only crossed paths with four other hikers so it was never too much of an inconvenience to find a place to pull off and let them pass. There are definitely parts of the path that are more sunny with very little shady but there are also wonderful shaded portions with larger rocks to rest on if needed. Our little 12lb dog made it without any problem and it took us about 1 1/2 hours.