First off what kind of environment was she rescued from? Alot of rescue agencies would probably label her a shepherd mix as alot of people shun pits, who by the way are not all bad and aggressive. I would veto out those rare breeds mentioned. Not many people would have a them. Almost every dog that is a mix has shepherd, lab, beagle and etc in them. When I first saw the face I thought pit. Not all purebred dogs look alike. It is possible for lab crosses to have skinny tails. Poor breeding causes many purebreds to look bad. Whatever your dog is the personality is what counts and it seems you have a lovely dog and that is all that matters. I too have a mix breed and for the life of me I am stumped on what he is mixed with lol, probably 5 different breeds. Maybe I ought to post his pic and she wahat others say.