I need some help with my boxers.  I let the dogs out in the yard this morining about 7 oclock.  A few minutes later I heard a great rucus.  It was my two spayed female boxers standing on their hind legs fighting.  By the time I made it outside April the larger of the two had Tina laying on her back and she was standing over her.  I yelled at her and kicked her side but they still went at it.  I finally started talking to April and she backed off enough for me to feel safe about grabbing her so Tina could get up.  Well I seperated them and assesed the damage.  Tina(the one on her back) had only one small scratch on her gum and April had a small cut by her eye.  I have no idea what started this fight but now I am scared.  Was it just a dissagrement?  Will it happen again.  After everyone had calmed down (about five minutes) I cracked the door so they could see each other and they immediatly started licking each other and Tina tried to clean Aprils cut.  Do you think it will happen again or should I imm think about trying to rehome one of my boxers.  Am I over reacting. 

Unfortunately, once bitches start fighting it often means that they have taken such a dislike to each other that they will never again live in harmony. I stress that this is not always the case, but you will have to be very vigilant and supervise them when they are together. If they continue to fight you will have to either keep them totally separated from each other or you will have to rehome one of them. Male dogs will have spats and then forget it, but bitch fights can be serious and there is no 'kiss and make up' afterwards. See how they get on, but be prepared for this to happen again.

Have to agree with Shadowboxer, bitches don't forget. Think you have to do the impossible for a week or so and watch them but at the same time try not to cause a tension. Hope it works out for you and I would see if you can workout what sparks them off should it happen again.

It could be days, weeks or months but the chances are they will fight again at some point.  Can you keep them separate (dog gates) rather than think of rehoming one?

If you do have another spat and can't get them apart the easiest way (if there is an easy way) is to manouver them to a door or gate and gradually close the door with one on each side.  This saves the problem of you having a dog in each hand, at arms length with them trying to get at each other and you not knowing what to do next. If there are no doors or gates available, put their leads on, tie one to a tree or immovable object and with the lead on the other as soon as they part drag her away. Yelling, kicking, water etc are all ignored once they really lose it.

Boxers are prone to thyroid problems, which can lead to aggression - might be worth getting both girls checked out by a vet (blood tests etc)

Well I found out today why they were fighting.  First a little back ground.  I rescued April three years ago when her owner tied her on a three foot chain in the yard and starved her down to 32 pounds.  She now weighs 75.  I just got Tina six months ago from a puppy mill.  She had never been around other dogs and had litter upon litter of puppies and was on her way to the pound very emicated.  They have been the best of friends and Tina is very submissive to every one in the house.  Well any way I went out this morning and Tina was still digging at the fence.  I made the mistake yesterday of thinking she was afraid and trying to get out.   I went over and looked and there on the other side of the fence a piece of bologna hidden in the grass.  That is right where the fight started.  April and Tina will fight over food.  I have always know this.  They are both so much better about it.  Even letting the little dog snatch some of their food.  I feed them both seperatly becasue I feel why ask for trouble.  Well yesterday when I went to work I found two slices of bologna on the hood of my car.  So, I feel certain in saying that whoever did that threw some pieces in the yard and one just happened to hit the fence and land on the outside.  I am watching them very carfully.  I have april wearing a collar and I have a leash in my pocket just in case.  Right now she has Tina laying on the floor with her standing giving her a through face washing.  Tina shows no resentment at all while April is a little reserved.  If anything happens it will come from April which is the reason she is wearing the collar.  I feel so bad.  I have been meaning to put up a seperate fence in the back yard so the dogs wouldnt go up front but just havent got around to it.  I will do it today.  To think this all started becasue of some moron neighbor.  

I'd check the yard over very carefully before letting them out if I were you - it's not unknown for people to try and poison somebody elses dogs by feeding them poisoned meat :(