Growling issues with 2 year Cocker

Question
QUESTION: We have 2 male Cockers, both nearly 2 years of age. They have not been neuted. Over the last few months one has started to growl and be more aggressive against his brother. The bother will of course growl back an stick up for himself.  They have recently started to fight more. We will say NO and stop him growling, and send him outside.
He is great on his own and with the children.  But is getting worse with his brother and growls when he gets a cut. He barks at other dogs, i think he is nervous of them.  When we stop him growling at his brother, he will growl at us before stopping.

Will neuting him solve the problem?  Should we get them both done?  is there anything else we should be doing?

ANSWER: Yes, you should most definitely get them both neutered.  Not only because of this "teenage aggressive behavior" but for health reasons.  Talk to your vet.  It's a simple operation for males and they'll be home & fine that day.

Now..how to handle this right now.

I have some questions.
1.  When and where does this fighting happen?
2.  What do you do? (Just say No and put him out?)
3.  How far does the fighting go?  Is it scuffling & growling or real attacks? Biting?

I just want to make sure you're not mistaking rough play and a little "I'm the boss" for a real problem.

And yes, I can offer some solutions.  
Delores

---------- FOLLOW-UP ----------

QUESTION: Q1 - Bert growls whenever the other dog, Champ is in the way.  It doesn't seem to be for any reason.  This week he has started to growl at us, but not showing any teeth. This usually happens when we tell him to do something, for example - go downstairs or outside.

Q2 - Yes we have been saying No and putting him outside.  I think this maybe the wrong thing and is why he is now growling at us.  I read on your other responses about the tin can with coins.  I used that yesterday, it seems to work.  He seems scared of the noise.

Q3 - I haven't seen many fights.  but I have seen them bite under the neck during the fight. They used to have play fights a lot, these fights seems more aggressive, they end up on there back legs. There hasn't been many proper fights, but I feel the issue will get worse if we don't get on top of it now.

He seems scared of other dogs, just runs to me and barks at the other dog. He did get run over by a push bike last year, so he is scared of bikes too.  We groom the dogs ourselves.  Bert hates his feet getting down, and will growl allot, showing his teeth at times.

Answer
Okay.  The next time he growls for any reason - I want you to get down on his level, be physically still, and STARE into his eyes and keep calmly & quietly saying NO.  Do Not break eye contact.

When he breaks eye contact, you just won.  The idea is to make him back down "on the spot".
Putting him outside isn't making a statement a dog understands.

The can of pennies is good to break up a scuffle when it's already started.  Raise can in the air and bring it down hard ONCE...say NO...the message is simple, you do THAT and THIS happens.
No scolding - conversation - yelling.  Just NO and one very loud crash.

In short order you'll just have to pick up the can and they'll cut it out.

I don't think you have a huge problem here.  Bert is playing "top dog" with both Champ and you.
Time to let him know he's not :)  Keep it fast and simple.

Let me know what happens when you do "Clint Eastwood" on him :) - the "NO" and the eyeballing him is very alpha behavior and most dogs will back off.
Delores