Can anyone direct me to a site which has the results of these studies that say a dog has to have low protein, I keep reading about it on forums like this but I've not actually read anything official on the subject, there seem to be differing views and the only studies I can find are based on rats which isn't really compareable lol.

To me the major part of a dogs diet should be meat which is naturally high in protein so I don't see how 37% could be harmful, I think a barf diet is around 55%.