On its initial cinema release, The Hills Have Eyes required some editing to gain classification. This DVD edition claims to be the uncut version of the film. From the information I have seen regarding this issue, that claim seems to be correct.
Two scenes in particular that were removed from an early VHS version have been restored on this DVD version. They are a brief image of a dead dog and Mars placing the barrel of a gun in Brenda's mouth.
None of the heavy violence in the film seems to have been edited in any way.