Hi there im studying aggression at the moment but would not really advice over the net, how old is the dog and as this just started is there anything at all that has spoked her i would keep a close eye on her and keep her on the lead on walk if she is showing this kind of aggresstion, it could be fear we need to ask ourselfs she is doing it for a reason but whats the reason, i would take her back on the same walk and watch her body language to see if you see it change if she is nervouse then take her away from the situation as it will only make things worse then maybe get a local behaviourist on a one to one to look at her behaviour x

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