99% of the time dog aggression issues are really just handler issues, start when they are pups and show them it will not be tolerated, and never leave them loose and unattended when they aren't being used.
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I agree Old Man! Most of the time aggression starts when they are a puppy and I will not tolerate any aggression. If you do not stop it then you are asking for trouble. I own the gyp that Charles is referring to and I have not seen her start a fight with my other gyps, but she will defend her self if needed. Am I a better handler? I do not know. But she is an extremely smart dog and has found hogs for me.