Your dealing with aggression (obviously). The problem is, without seeing the dog in-person, I cannot tell which type of aggression you are dealing with. The reason that's important is that the treatment for one type of aggression will feed the other, and vice versa.
What you must do is find an animal behaviorist or trainer who can help you in-person. Trust me. It's very dangerous to try to solve this problem on-line. If you decide it's one aggression and it's another, you will doom the dog. It takes years of training to be able to properly distinguish one from the other. Subtle non-verbal body cues your dog is giving will be the tell-tale signs, but it takes a trainer to be able to read them correctly.
Please see if you can't find an animal behaviorst in your area. If not, see if you can't find a professional trainer who can help. I have to tell you, regardless of the type of aggression, this will take a lot of work, and more than likely, you will be working with this dog the rest of it's life. There is no quick fix to aggression. No magic pill. Just lots of work and training you can do to control it. And, depending on the type and severity, it can be controlled.
BTW, an animal behaviorist has a graduate degree from a university. There are people out there claiming to be Animal Behaviorists who do not have the education. A professional trainer will have on-hands experience as opposed to a degree. For aggression, I prefer the behaviorist, but would turn to a good trainer if there are no behaviorists available.
MACH Aslan RE, MX, MXJ, EAC, EJC, OCC, Wv-N, TN-N, TG-N, R-SN, J-SN, R2-CL, CGC, TDI, FFX-AG (five year old sheltie)
Jericho OA, NAJ, R1-MCL, CGC, FFX-AP (three year old sheltie)
Laika NAJ, CGC (nine year old retired American Eskimo)
I've been defrosted.
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