You have my email in answer to the one you sent me regarding this question jabber and hope it helps. It is one way to protect you from any lawsuits and protect the other dogs Zena is around and her as well. I would also keep her exposure to other dogs as limited as possible.

Have you had a brain scan done? My black German Shepard I got from a vet returning from the Korean War back in the day, turned aggressive after several years for no apparent reason. They finally did a scan and found a tumor that would cause her pain and she would attack for what seemed like no reason. It was inoperable and she had to be put down and out of her misery...

Today they probably could have saved her but I will never know.
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http://charleen-micheles.blogspot.com/