no theres not a huge variation within the douge..if you select for a real protective and athletic dog you will get a real protective athletic douge,they are out there,however they are a laid back breed by nature,calm like many of the giant mastiffs..Some of the show dogs are just lazy slobs,some have nervous sketch temperments,many bordeauxs are dog aggresive no matter if they are show dogs or not..just like any breed there are good and bad dogs,select for what you want and youll get a great dog,you cant lose with a good douge...