I agree with the overwhelming majority of the comments posted on that site.
The owner deserved to be arrested, and jailed for assault with a deadly weapon. She had every opportunity to simply comply in the first place, and when she opened up the door and gave the order to the dog to attack, then the dog did what it was told, and attacked the officer.
The dog is a dumb animal; it did what it was trained to do, and that was to protect its owner from its own point of view. However, it was the dirt bag owner that twisted this loyalty, and used that dog as a weapon in a criminal manner.
I found it really pathetic at the end, when the owner was crying and saying "I didn't want to be arrested!"