Even if you only stop and focus on your breathing for a few breaths, or for a minute or two, its very valuable.
Anger is like a storm rising up from the bottom of your consciousness. When you feel it coming, turn your focus to your breath.
Breathe in and take one step, and focus all your attention on the sole of your foot. If you have not arrived fully, one hundred percent in the here and the now, don't take the next step.