Hi,
I'm new to this forum. Has been interesting reading...

I have two australian terriers, a boy aged 12 and a girl aged 5. I got the boy when he was 8 and the girl when she was 5. They are generally great, however, every now and then have a rather vicious fight. It started originally as I used to let them sleep on the bed. I realised that I was the trigger there, so I removed myself from the night -time picture (no, they did not get the bed!).
This reduced the number of spats has not eliminated them entirely. Others have been caused by 1. the boy yelping (say when you step on him by mistake - bad enough already but then to get a gremlin attack you is not so good), 2. phone ringing while sitting in the lounge - haven't figured this one out. I have reduced the volume of the phone though. 3. letting them out from the laundry (where they sleep), where there must have been some look or something? Not sure.
There is generally no prewarning just a lunging and attack. She has drawn blood and I have not waited to see how long they would go for. generally he gets angry for being attacked and does not give in. I usually end up having to drag them apart - never a good thing.
I have tried a few different training theories, many discussed on this site, including Cesar;s methods (which worked to some extent), treat training (they love their food) but not sure if they see me as a leader or food-lady?, and even getting a trainer in who worked with a lead on their collar.
Any suggestions??