There are NO wolves in the Grand Canyon!
I just rolled my eyes when I saw the trailer... The last wolf in the Grand Canyon was killed in 1942. There are currently efforts to reintroduce them back in the canyon, but their portrayal as vicious hunters of humans in this movie is not going to help the cause.... They don't hunt humans!
Oh, and another thing, you really can't get lost in the canyon for too long, there are so many landmarks and so many people, one should be able to find a trail in no time.
Only accurate thing I saw in the trailer... there ain't no cell phone signals out there... zero bars, folks!