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Hello, I'm Dr Gary. I've been practicing veterinary medicine since 2007. I look forward to helping with your questions/ concerns.
I'm sorry to hear about your dog. I know this is not an easy situation.
I think your next step is going to have to involve a veterinary behaviorist and probably some type of medicating. I don't think a typical dog trainer is going to have the expertise to deal with a dog that is this dangerous to be around. There are some good trainers out there, but I think you need a veterinary behaviorist.
To find a behaviorist, you can go to this site and search for the nearest one. There are not a large number in the country, so it may involve some driving to get to one. They work with difficult dogs like this every day, though, so they'll be able to help him.
I would also advise trying a medication like Clomicalm or Trazodone or Prozac to get that in his system. These are all good behavior modification meds that can help take the edge off and help prevent some of this aggression.
Here are some other write ups on aggression in dogs with some more info:
I hope you're able to get the help you need. Let me know if you have any other questions.