There’s no shade at all on that trail. I read the dog was big and on a leash. From what I read there’s a short trail and a long one and they might have gotten confused and took the 8 mile one. There’s also been a lot of dangerous algae in the water this year if they all drank it. But hikers usually carry a special filter if they think they will need to drink the water. These people weren’t new to hiking.