This is a very real problem in any deep-chested breed, which includes most of our hunting breeds. It is an awful condition to treat, and in fact I lost a Weimaraner patient to this condition yesterday after a long and frustrating 2 hr. surgery. Nationwide mortality rates average around 50% with this condition. The biggest problem is "reperfusion injury", which occurs AFTER the condition is corrected. While the stomach is twisted and bloated the blood circulation is blocked and cellular death begins to occur rapidly, with accumulation of many toxins in the tissue as a result. When the volvulus (twist) is corrected and blood flow is re-established, the toxic substances in the tissues are whisked into the bloodstream where they have severe systemic effects and there is little you can do to prevent it, regardless of the fact that many researchers have tried and suggested various methods to reduce the effects. This is what killed the patient yesterday, about 3 hrs post-op. It was already comatose when it came in the clinic and the owners were given a grave prognosis, but they wanted us to try anyway.
Chuck, I see no problem with your practice - a very light meal (say no more than 1/4 of daily ration) at least 2 hrs. prior to activity will allow the stomach time to complete its function and move the contents into the small intestine where they will not contribute to the probability of GDV.
Also, it is important to note that while activity after a large meal certainly increases the risk, it is not necessary for GDV to occur. I have seen dogs develop the condition that had no activity whatsoever after being fed (i.e. kenneled dogs). I believe, based on the stomach contents, that they were fed large meals on a once-daily basis, and probably bolted the food which for some reason is a big risk factor.
