Dog Health Questions: My dog won't submit to me when around other dogs.?

I have a two year old pit bull, she's spayed. I take her to the dog park, she gets tons of excersise. I have another mix breed, neutered. Whenever people are involved (ie when they aren't paying her attention or sitting with the other dog) she gets aggressive and inisiates a fight, I pull them apart and roll the other one over to submit, and with her she WILL NOT do it, she fights like hell to stay up right, she never gets aggressive to me when I try to put her on her back to calm down, it's like she knows she wrong but doesn't care. She is NOT aggressive to people, she isn't aggressive with food, toys, beds, the couch, just over the attention of people to other dogs.

Please help! I've tried dog training to no avail, I'm at a loss???

Secrets to German Shepherd Dog Training

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I figured I'd answer since I didn't agree with the other two answers. First, you're in a dog park so a leash isn't what you need. Also, rolling your dog over will not frighten your dog and make it more aggrassive although it is a form of intimidation so they no that you are in charge. My dog fights it sometimes but I just pull her legs out from under her so she has no choice. I would recommend getting a shock collar to correct her. I got one for my dog and it works wonders. You say no and if she doesn't stop you shock her. Pretty soon she stops just from hearing no without the shock.

How to Incorporate Dog Training Into Dog Play and Exercise!

• This is NOT dog training... this is an attempt to frighten your dog. The only time dogs roll each other over is if they are going to kill the other dog. There is no reason for you to ever roll over either of your dogs. It is an agressive act from you, in attempts to intimidate her. If you keep doing this she WILL become agressive towards you.
  
  Take your dog to a PROFESSIONAL trainer or behaviorist. Until you get to the trainer, manage the situation. Don't put her in a situation where someone will be paying attention to another dog and not her. If you've tried dog training you've surely crate trained her. Put her in the crate when people are going to be paying attention to your other dog.


• just putting her on her back after she has already started barking/fighting wont do a thing.
  
  firstly - keep her on a leash and if she even looks sideways at another dog, say NO (loudly and firmly), and pull her back to your heel (close, next to you). you should NOT be waiting for it to get to the fighting or even barking stage before you reprimand her. reprimand her immediately every single time she looks like she might get exciting or start going for another dog, not after she is already there.
  keep a look out when walking her - you know the situations when she starts doing this - the SECOND she tugs on that leash, pull her back immediately. stop it before it starts.
  
  You MUST be consistent or it simply wont work.
  .