Personally I think that Abu Garib was torture. Regardless of whether it was mental or physical, it was designed to break them. Lyndie England even admited to that.
American MIA/POW may have been subjected to fearsome kickings by the Vietnamese, but this was because the Vietnamese were not very good at torture. If you want info physical means are practically useless, as if you kick someone enough they will confess to being elvis if you want them to!!!
The techniques that seem to be used in Abu Garib seem to be a little more subtle. Humiliation leaves scars, but not physical ones, and can open a person up better than a kicking.
Anyone who things the guy with the dog is not bricking himself is deluded. He is likely to be very afraid. I doubt very much he trusts his captors to prevent injury from the dog, something that the humiliation is designed to do, how do you trust someone who has subjected you to this sort of treatment.
The pictures are all 2D and show little of the hidden depths of despair and fear that these people will have fallen to.
The kicking those lads got after throwing stones was not torture. It was simply a good kicking, the prat who videoed it on the other hand needs a similar treatment.