Definately a German Shepard or Rottweiler they are the best guard dogs I think, but it depends if you want a really mean dog that you have to put out in the yard when people come over ,or a dog the is only mean to people it knows?And I totally agree with Sudilar:

****SAVE A LIFE ADOPT****

[This message has been edited by SheltieLover234 (edited November 20, 2000).]