my 8 month old german shepherd dog is coward what shud i do to make him a sharp and dangerous dog?

No you can't do much to change his temperament. A shy & timid dog usually stays that way. Some out grow this but some don't. I have a female GSD that is the same way. Poor breeding is the cause. I got mine from a BYBer that was taking the last pup that did not sell to the pound & I took her. She is 3 yrs old & has always been timid & fearful of things she hasn't experienced before. She will bark at the things on the street but if it were a face to face encounter she will tuck her tail & stay way back or head for the back yard. It is just her temperament.

Yes you can.

Either accept the GSD is genetically disposed towards fearful behaviour or rehome it to someone who will work to obedience train the GSD & control its behaviour/environment.

You cannot change what nature has given the dog, only train the dog with calm, clear, stable & non aggressive leadership.

A GSD should be stable with strong nerves & not exhibit random aggressive behaviour & be dangerous. A dangerous dog is a liability for the owner, a threat to the public/other animals & could be euthanized.

It is people who purchase a GSD, Dobermann, Rottweiler ect then fail to train & control them, who considerably contribute to the breeds bad reputation.

Get him used to loud noises strange sights and all asects of your enviroment. You should not turn him into a dangerous dog because not only would you be an @$$#hole for ruining the dogs life but one day it may turn on you. It all gos back to how dogs in the wild live, the pack leader or dominant creature is always the more agressive one and can turn on any of its followers for no given reason. Take your dog on walks or exersise it daily and train it well. If you do things such as always walking in front of it on walks or even just walking out the door he will respect you and obey you. He will then begin to protect you if he feels you are in danger since they are indeed smart animals but he will not be a vicous guard dog that barks at everything and everyone. If you do all that i have said he will be friendly to you and anybody that you care about and will protect you against any threat. This is demonstrated when he lifts up one of his front paws when in front of you which is his way of saying "I'm gonna protect you nobodys gonna get near you" In all treat your dog kindly and with respect. Abuse towards him will later turn in abuse towards you. Respect him and he will be a loyal companion to you forever and always

You should not want your dog to be dangerous. You should want him to be confident and not fearful. If he is dangerous and out to attack, he may one day attack you, other people, or other dogs unprovoked and you will have to put him to sleep and/or have to deal with expensive law suits, vet bills, etc.

If you want your dog to be confident, you need to handle him with confidence.Fearful dogs especially need a confident owner. When he is being fearful, DO NOT coddle or pet him because he will take that as encouragement for his behavior. When you see other dogs while you're walking him, don't pay attention to the other dog at all. Just walk on straight ahead with your back straight. He may still whimper or freak out a bit but this will help calm him down when he sees that you don't care, you're not afraid, etc. You should also start praising him more when you see desirable behavior and put him in different situations and environments to desensitize him to different things.