I am sorry you are having problems with Cooper. There could be a number of things going on. Has he had any rabies vaccinations lately? I have read that over vaccinating can cause fear aggression. Vaccine induced aggression and dog attacks - National American Pit Bull | Examiner.com
Have you noticed him having any vision problems? Is his hair out of his eyes? Has he experienced any kind of aggression from another animal or person? It sounds like something has made him fearful of people. I pray you can get some answers. Please keep us posted.
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