If the fur stands up for Rex breeds, it does on his little face, but the fur seems to lay mostly flat over his body. Which leads me to believe he may be a mix of French or other breed. Who knows, it could just be from petting him. His personality is really warming up and now he is fully potty trained! Smart little fellow, as most buns are! Being an animal guardian never felt soo good. Rex is good for me as it is good for him; I told Doozy earlier and he approved. :thumbup