how to train a guard/attack dog?

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we have a 5 month old boxer who is very smart and learns easily. stubborn at times but thats part of the breed. we would like him to be territorial and protective but not out of control. (and of course, my wife would like him to attack on command, if the appropriate time should occur, ie; burglars, intruders, ....) we also want to make sure that he is able to stop at command as well. we dont want him to attack other dogs nor do we want him to attack people walking down the street. we live in san diego and would like to know of any programs or tips on how to do this. thanks in advance...