Easy Online Dog Guide

i asked this question before, wrote attack dog training, i think ppl were under the impression that i wanted my dog to visciously maul the first person he sees.but thats not what i meant. i want him to be a guard dog, and like the dogs that police use. like if i tell him to attack he will, but will also be gentle enough to have around kids. just need training tips and if anyone has training instructions please tell me. im not training him to do this for bad reasons, but to protect my family from danger and eventually he can join a special k9 force that my uncle is in, when he and i are older.

Cristopher