A friend of mine got a giant schanuzer male,not neutered.
He is a fine dog,eccept he hates male dogs.
When they are out for a walk,and he sees a male dog he gets mad.Barking and growling tries to reach the other dog.
As his owner holds the leash,he turns and bite her in frustration.Not hard,but hard enaugh.
She do not know what to do.
I have told her to get a muzzle so she do not have to be scared that he would bite her.I also told her to get a prong collar and correct the dog hard.With the muzzle on the dog,she would not have a problem with it.
Was it a good advice?
The dog gets mad when he is anout to have his nails trimmed.
And when he is chewing a bone the owners cant go near him.
Otherwise he is fine.No pulling on the lead,no food guarding (dry dog food).

I'm fairly new here, so take my "rookie" opinion for what it's worth...

This is a textbook dominant dog. She needs to lay the groundwork and take her time. For the time being, avoid situations that provoke this kind of behavior until he has more respect for her. Everytime she walks him (with or without a muzzle) she's asking for trouble. I would suggest a couple of Ed's articles.
Dealing with the Dominant Dog
Ground Work for establishing yourself as a pack leader

sounds a bit like the mal i took in here 4 weeks ago. She would do the same not the reaction as you talk about with dogs, but with cars, bicycles etc. Once the correction came she'd turn around and nip hard in my arm. I took the opinion she can try whatever she wants but shes not winning this game of hers. I didnt put a muzzle on her because i wanted to hit it head on and didnt want a muzzle working her up even more, also remembering that I had to take the thing off too at one point <img src="/ubbthreads/images/graemlins/grin.gif" alt="" />

I didnt avoid the situation but went looking for it armed with a thick jacket <img src="/ubbthreads/images/graemlins/grin.gif" alt="" />. Id rather get it over with than let it draw out for mths and mths. I took the view "ok lady you want a battle ...you got one". Even yesterday i put her on the prong collar and a long leash...........and went looking for cars on the busy road. She had yet again a few attempts at doing her thing but gave up after the second try. She came running back to me i rewarded her, finished the walk and played some ball in the meantime. Shes one hard headed lady this one but Im going to win and as soon as she gets it thro her thick head the better <img src="/ubbthreads/images/graemlins/smile.gif" alt="" /> <img src="/ubbthreads/images/graemlins/grin.gif" alt="" /> <img src="/ubbthreads/images/graemlins/grin.gif" alt="" /> Each day she loses and gives in and until im sure i have won this battle i will go looking for the situation for as long as it takes <img src="/ubbthreads/images/graemlins/wink.gif" alt="" />

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The dog gets mad when he is about to have his nails trimmed.
And when he is chewing a bone the owners cant go near him.
Otherwise he is fine...

What? Are you kidding??? Somebody's in denial. This is VERY basic stuff. I echo what Ryan said plus read Ed's article on theory of correction AND get the Basic Dog Obedience DVD ASAP. It's either spend the $$ on that or on stitches.

I know.Very basic stuff.
The schanuzer and owner has gone to obedience classes wich did not work to get the dog more obedient.
She has had a halti on,but refuses to put him on a prong collar or a muzzle.
I am fed up giving info and help to dog owners that not listen.
It is quite clear to me that this dog is dominant and that the owner has a problem.

Then what you need to do is make it clear for her. His "bad habits" are signs of a potentially serious problem. If your description is at least fairly accurate, he's easily "fixable", but she needs to get a grip before the dog gets a grip on somebody's kid.

Tell her, in no uncertain terms, that this dog is showing signs that he may have dominance and possibly fear issues which are two of the most common reasons for vicious dog attacks. Both are HANDLER problems in 99% of cases, and if she doesn't do something, it will be her fault when the dog crosses a line and does something that can't be undone.

He is not a fear biter,he gets along well with other dogs as long as they are females,small dogs or puppies.
He is good with kids.No sign of aggression.
He lives together with a mini schnauzer male,no problems at all.
off leash he does not seem to be that agressive.
It is a handler problem,at it always is.

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The dog gets mad when he is anout to have his nails trimmed.

That's fear or dominance, or both.

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he gets along well with other dogs as long as they are females,small dogs or puppies

So only dogs that put his dominance in question pose problem for him? Duh... most dominant dogs are only dominant with animals they feel a need to dominate. That doesn't make it ok. Allowing dominant tendencies to continue leaves the door wide open for them to get worse. What happens when he decides to dominate a child/dog when there isn't a capable handler around to stop him?

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He is good with kids.No sign of aggression.

Any dog that tries to bite his hander is nowhere near stable enough to be around kids in my opinion. The situation is different, but the lack of control is the same.

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Off leash he does not seem to be that agressive.

Why is a dog that is disrespectful enough to snap at his handler EVER allowed off leash?

I'm not the world's most experienced handler/trainer. Far from it, but it sounds to me like you're making excuses for some of the dog's behavior and that gets us dog people into trouble. Dominance is dominance is dominance. If the dog is poorly behaved enough, disrespectful enough, or confused enough to snap at his handler, there's a problem that needs to be fixed. Just my two cents.

I am not making excuses,i just wrote what i thought. I am no dog trainer,and i do not claim myself to be an expert on dogs either.
I wrote in hope to get peoples opininons so we can maybe find out exsactly what the dogs problems are,and go from there.

So you think he is fearful? then we may have to take a different approach.We thought he had dominant dog issues.

Look at the section of articles on this forum, you will find the symptoms of what is wrong with this dog...follow the guidance in the articles, they are very good.