[quote=NickD] I had him at Univ of Penn for blood analysts and chemical makeup and I was told he had all 3 triggers for aggression ..even though he never showed dog agression..[/quote] Blood tests for aggression?...or do you mean THYROID issues, which can cause unprovoked or unpredictable behavior. :?: A lot of behavioral problems which are due to underlying medical issues are often inappropriately considered to be "born bad." BTW, do you think Mr. Bundy's childhood abuse had nothing to do with his behavior later? How can you prove someone or something is "born that way."