QUOTE
I just worry about overheating in this state. The runs seems really short in a not so warm arena (I run in a down coat) for this kind of panting. I crate him covered in between practice runs to help calm him quicker.
Thanks for the additional info. I think the first thing I would try to do is determine what is going on with the panting. It could be straightforward physical overheating. Or, it could be a result of stimulation.
When he is panting, what are you seeing going on with the rest of him. Do his eyes have an intense expression, or a relaxed one? What is his tail doing? Is that what his tail does when he is relaxed?
If he is, indeed a worrier, the panting could also be caused by stress meeting stimulation. That's a tough mix for a dog to handle when both are bombarding him at the same time, especially in a highly stimulating situation.
QUOTE(in2adventure @ Feb 12 2010, 09:32 PM)

I think the statement about him learning to cope with his own activity might have hit the nail on the head. He can sit on the sidelines watching flyball and not so much as twitch. It's his own motion that triggers the over stimulation.
The control games range from simple every day things like sitting at the door after it's open until I release him to crate games to down stays around the agility equipment without using it. The last one seems to help the most. Doing other things around the equipment without using it until he's calm and focused. He can do a wonderful down stay while I run (yes, run) 3 or 4 obsticals away before releasing him. Sometimes I run back, we play and then do it again before actually letting him run the sequence. It's not until he's actually running that he gets over active and starts to over heat. Courses or sequenses only last for 5-7 minutes. This includes talk and discussion of the run, what needs to be worked on, rerun, discuss, etc.
The common thread that I see in all of the control games that you are playing is that he can remain stimulated throughout those games. Yes, he's in a down while you are running, but even holding that down as you run away can be stimulating for him, and then when you return you stimulate him with play. Does that make sense?
So, you run away - he can remain stimulated - then you go back and play - more stimulation. For a dog who is easily overstimulated, stimulation tends to lead to more and more stimulation.
Based on what you say, I would focus on his stimulation levels and try to help him get those a bit more in check. I do suggest some mat work from Control Unleashed. In the mat work the dog learns more than just a down-stay. The dog learns to mentally relax while on the mat. By relaxation here I don't mean sleepy relaxation, or the kind of relaxation that a dog would have while getting a massage, but active relaxation.
Once your dog has that down, you can start to play games where the dog learns to toggle between relaxation and an excited (good-excited, not overstimulated) frame of mind. Once the dog knows the foundation game, you can take some variations of that into the Agility setting.
I have found that helping a dog who is stimulated by his own motion is a bit of tougher challenge than helping a dog who is stimulated by external motion. But there are things that you can do to help.
If you are concerned that this might be physical, a vet check might not be a bad idea. Otherwise, I would definitely start working on some conditioned relaxation and bring that into the sequences in class.