I've seen this in several places and thought I would share it here in case you haven't seen it.
University of Minnesota - EIC in Border Collies
"An exercise-induced collapse syndrome similar to the EIC syndrome in retrievers has been recognized in Border Collies and may be called Border Collie collapse (BCC) or exercise induced hyperthermia. It is most common in dogs used for working stock but has also been seen in dogs training for agility or flyball competitions and in dogs repetitively retrieving a tennis ball. Affected dogs are normal at rest and seem healthy but become abnormal after five to fifteen minutes of strenuous activity, particularly in warm weather. Some dogs will develop a stiff, stilted gait with short strides and others will become wobbly and then collapse. Some dogs develop a balance problem or are mentally abnormal during an episode, and a few dogs have died during collapse.
This syndrome has not yet been well characterized so we are uncertain whether this is a metabolic, muscular or nervous system disorder. Affected dogs are negative for the dynamin 1 mutation causing EIC in Labrador Retrievers.
If your dog has had 2 or more episodes of collapse we would like your help as we try to describe the syndrome and search for the genetic cause. Please take the time to fill out the questionnaire and send us a DNA sample and pedigree from your affected dog. If you have a video of your dog having an episode we would like to have the opportunity to view that as well."