2 male boxers fighting

Question
I have a 4 yr old male boxer & a 2 1/2yr old male one fawn & 1 brindle. They usually get along pretty good until the past few months their occasional spats seem to be getting more sporatic.My younger male seems to be the aggressor most of the time. I am considering neutering the youngest one to see if that will help.Because i cannot control them when they get into that spell & i am scared they are really going to hurt eachother. Is there anything else besides neutering that may help also? Thanks!

Answer
Neutering may help but often it's not only the testosterone the dog itself has, but the 'scent' of testosterone in other dogs that is a trigger for fighting, so you may need to neuter both.  It takes several months for testosterone to leave the system entirely, however, so you shouldn't expect an immediate cessation in the fighting even if neutering does solve the problem.  

The most likely scenario is that they are fighting for 'position' within the pack; establishing yourself as the clear leader can help, because they will no longer be jockeying for that position.  (However, they also know that you are not a dog, so there are sometimes two hierarchies in any household.)  Start refreshing their obedience training, and put them on a NILIF (Nothing In Life Is Free) program to remind them of and enforce your position as the one who makes the rules and controls the resources.  Especially work on building a solid down-stay.

http://k9deb.com/nilif.htm

There are a few books that you might find helpful:
Fight! by Jean Donaldson
Fighting by Ian Dunbar
Feeling Outnumbered by Patricia McConnell and Karen London
Aggression in Dogs by Brenda Aloff
The Other End of the Leash by Patricia McConnell
Bones Would Rain from the Sky by Suzanne Clothier

You might consider muzzles as you work through this issue - you don't want them to get hurt (or yourself!).  Be sure you know how to break up a dog fight without getting bitten (a tip - throwing water on them generally just gives you wet fighting dogs!).  A qualified behaviorist who can observe the dogs' interactions and evaluate their body language and triggers would be invaluable.

http://animalbehaviorcounselors.org/acabc_members/
http://www.inch.com/~dogs/behaviorists.html

Sometimes it's past the point of reconciliation, in which case the options are to keep them separated - always, for the rest of their lives - or rehome one of them.  These are obviously not the ideal options, but in the long run what's best for the dog is the important consideration.

Good luck!