When the dog pen is shown with the skeletons of the dogs, while one skull does belong to a dog, the close up shows a skull of an herbivore like a deer.
What are the differences between the R-Rated cut and the Unrated version of the movie?
A
Well there are only minor differences between both version but the R-Rated cut misses out some violent scenes and a more detailed rape scene. A detailed comparison between both versions with pictures can be seen here.