Dog Training Questions

Joseph asks…training a guard dog.?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

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