[QUOTE=Yorkiemom1;3930142]I agree with this theory above....I am not qualified so I will not give any advise on training...I dont think your dog was "attacking" YOU....I think she was caught up in the moment, her adrenalin was rushing thru-out her body, and she was in "fight or flight" mode...she felt pulling on her collar, and she bit at that annoying deterrant to her immediate goal at hand...neutralizing that small dog.  I am a huge proponent of "avoidance"...."if you cant stand the heat, stay out of the kitchen" mindset....therefore, I do not take my dogs out in public, off leash...we do not frequent dog parks....I like to be in TOTAL control of any situation I put myself or my dogs in, so I simply avoid the possibility of dog fights, run away dogs off leash, etc ....we all just stay in our own little corner of the world, my large yard. I do not trust training when a dog is taken over by instinct....I believe they will throw caution and any education or training they have ever been subjected to, to the wind and act like maniacs, driven by base instinct.  Only after the initial frenzy, when they regain a modicom of their senses, will they even HEAR you yelling commands, which they MIGHT then obey, if they have managed to get past that initial surge in their system. I did learn something from the trainers on site here!  
Grabbing the hind legs and walking in circles, putting them strictly on their front legs, is brilliant![/QUOTE] 
Yes it is a good one.  How-ever I've never tried that with a Pitbull.  I'm not sure if you'd be able to break the focus.   My trainer who also trains protection, carries with him a dowel type of rod.  It is meant to release the jaw bite.   This is for the breeds that bite and lock on. 
I agree once the fight ensues - commands will rarely work, unless your pup has been protection trained, and has learnt the "out" command.  
I was thinking here of when the Shepherd started to run - the STOP command.   
I have started to "rethink" leasefree parks.  Most of my breeder friends don't utilize them at all.  For various reasons.  I'm guilty now of taking my dogs to out of the way parks, in off times, to exercise and train off lead. 
Once a week or so, the Blackies and Yorkies, all get together at one of our breeder friends country places, to socialize and train together.  That is a lot of fun

  But still we are very careful.  With the puppies, we socialize with one or two well trained and stable adults, with 4 human adults, monitoring. 
I think I might have posted a video called Labour Day training that shows the Yorkies, Blackies, and one border collie training.    Our Blackies get to socialize together,
 after they have trained together.  There are a few reasons for this; a) obedience training is tiring both physically and mentally for the dogs   b) training in a pack builds a pack mentality  c) they have fresh reminders of just who is the boss, and our keyed into you and your commands.  d) in training we can perceive/tell if one or another dog has an objection to each other.