re: #10 darthstar
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We had a dog like that. You never knew when it would turn and bite. Took it to a dog behaviorist. Found out that the dog never gave any signals of submissive behavior (drop head, licking, etc.) It simply could not respond properly to a human, even its owners. It also had a couple of other behavior problems (circling) We had a young child and simply could not keep it.
It was tough.