My female english bulldog is 16 weeks old and I can't break her of pulling on her leash. I use to use a harness but she pulled more so I quickly switched to a collar. For her age and size she is very strong compared the other puppies I've been around. She has almost pulled me over a few times when she caught me off guard. She is giving my arms a workout when trying to go on a nice walk. So far before I leave the house I make sure I'm in the mood to walk so I'm relaxed and not all stiff. I don't do or say anything to cause her to become hyper before walking out the door. I simply walk over to the door and hook on the leash and make sure I go out the door first to show my leadership. She usually starts pulling in the house before the door is even opened. She isn't pulling in a way that she is afraid of the leash. She is use to it but wants to go where she wants to. Outside when I start walking and she starts to pull I turn around quickly and walk in the other direction but she somehow manages to find something as soon as she turns around to pull at again. I forgot to add that I have a 6 foot leash but i wrap part of it around my hand so I don't lose grip and to make it shorter. I also try to not let her walk infront of me. She can walk beside or behind. I do praise her if she goes a few feet without pulling but that rarely happens. If she sees another dog or a cat she will go on a run to try to get to them. Even if I turn around she is still pulling towards them. I've even done the tree method of not moving at all. She will pull till her front feet are hanging 4 inches in the air, gagging, and sometimes even vomiting. That is without me moving or even pulling. That is just all from her pulling. She weighed 16.5 lbs. a few weeks ago and I'm assuming she is around 20 lbs. now or more. I need to get her out of this fast before she starts dragging me. I've been trying to break her of this since she was 9 weeks old. I thought about trying a high collar but I haven't seen one and don't even think it would work on her. Also I prefer not to use one of those on a puppy. I have some 10 year old cousin-in-laws that come over that would like to walk her but I know she would drag them. I'm only around 110 lbs. and she gives me a workout. I'm looking for any advice. I've been looking around online and watching the Dog Whisperer and It's Me or The Dog shows for tips. Doing a sound doesn't work either when I go to turn around. She just ignores it. I'd appericate any help I'd get.