TIP #1: KNOW YOUR DOGS' TRIGGERS
We know that aggression is usually caused by stress, and it's often relatively easy to identify the immediate trigger for your dogs' mutual aggression. It's generally whatever happened just before the appearance of the hard stare, posturing, growls, and sometimes the actual fight.
When you have identified your dogs' triggers, you can manage their environment to reduce trigger incidents and minimize outright conflict. This is critically important to a successful modification program. The more often the dogs fight, the more tension there is between them; the more practiced they become at the undesirable behaviors, the better they get at fighting and the harder it will be to make it go away. And this is to say nothing of the increased likelihood that sooner or later someone - dog or human - will be badly injured.
- The Whole Dog Journal
TIP #2: TURNS CAN BE TRICKY
When first teaching your dog to make a turn in the heel position, make sure you mark and treat through the turn.
Jeff Dentler, CPDT-KA, IAABC-ADT, FFCP, CTDI