There is a rule of thumb for the area that dogs are only allowed where vehicles can go. Dogs, even leashed, are not permitted on the trail.
Camping at the Hoh Campground is first come, first served costing $20 per night. There are a total of 88 sites available. Wilderness camping along the Hoh River Trail is a $5 per night per person fee. For the Martin Creek Stock Camp, Elk Lake, and Glacier Meadows sites reservations are needed between May 1st to September 30th. Visit the Olympic National Park website for the mailing address to submit reservation requests.