We got her from family friends who have taken care of a lot of dogs/puppies. When we got her they said she knew simple commands, and leash walked very well. She is a six month old English Mastiff now, and if you know the breed, you know she's a large dog. We take her on the same walk everyday, and right around the moment the house is out of eye sight, she stops, and sits. If we pull her, she leaps up in the air, and tries to knock you down. If you still try to pull her, she then dramatically falls to the ground, and lays in the street. My 54 year old mother has to pick her up, in a bear hug, and walk her on her two hind legs to get her home. We've tried a normal collar, a head harness, a muzzle lead, and now a harness. All these things are nothing to her, please, does anyone know how I can walk her?