aggressive female dogo

I have heard of getting an aggressive dog under control. But I have heard of big foot too. How old was she when you got her? Do you know her history? I say a dog never bites without a reason but you may not know the reason. If you don't know why she attacks you can't correct the behavior. I have had to deal with too many dogs like that. People could not do what needed to be done and dumped the dogs out in the country. Then they killed other people's dog's. I lost two dogs because someone did not want to put a dog down that should have been. Some people call it a fight when I say they are establishing dominance. But to take a chunck out of another dog is a fight. then other dogs will learn to fight and you have to put down more than one dog. I used to work with guard dogs and there is no way I would put that dog out anywhere. That is a lawsuit in the making.