Anything when used as a weapon, regardless of it's actual intended use, is regarded by the police as assault.
So you have to be careful. However they should take into account the circumstances in which it was used.
3 men against one woman, they might turn a blind eye unless one of the people sustains a serious injury.
Also if the dogs protect the owner, If the men claim that she urged the dogs to defend her, they could be deemed as being used as a dangerous weapon and taken away and destroyed.
You are allowed to defend yourself. however it is the degree of force used in defending yourself that is in question.
Our society is crazy in that the victim can end up a criminal by defending themselves.