I have had a little experience with the hyper-doodle"Cujo" syndrome. And I sympathize completely. Here a few suggestions that have worked (sometimes) for me and my two doods:
1. Try to see the Cujo frame of mind as an "unstable" (Cesar Milan's word) condition and that it is your job to bring "stability." What this means to me is when this behavior starts to happen I cease any and all behavior of my own that could be considered excited or unstable. Including, but not limited to, laughing, clapping, yelling, shouting "no!", chasing, calling for help, beating your own head against a wall. I mention these because I have tried them all and they do not work.
2. Get dead solid calm and quietly move the cujo doodle outside or into the crate. (This can be problematic if you have to catch your doodle first, so it usually helps to have an extremely desirable treat in your hand.) Give a treat, saying nothing. Shut the door and leave the room.
3. Come back when cujo is acting like a doodle again and (still quietly and calmly) open the door. If cujo returns, repeat steps 1 & 2 above for a longer period of time.
3. (optional) A radical approach involves getting yourself another doodle and letting them play "Hyper-Doodle Cujo" with each other, outdoors and without human intervention (especially not children) Only take this step if you are completely bonkers for doodles. I mention this because I am and I have tried it and it works.
4. Continue this approach for 4- 6 months. Repeating the steps above as necessary. You will begin to see a new symdrome which we call the "speedbump doodle." Cujo will return briefly from time to time, but less and less often. Really.