I have to agree that #4's generally suck as guard dogs. However, if the burglar entered the house with a well bred #4 - the other guard dogs would all probably take a hike. IMHO I personally believe the Fila Brasilero or Neopolitan Mastiff are at the top of the list of guard dogs even though it depends more on the individual dog more than the breed. My favorite breed is still the #4.
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