I'm offering advice for owners of dogs with large rib cages?

During a recent visit to the vet with one of my dogs I was told by the vet that as he has a huge rib cage (he's German Shepherd - Irish Wolfhound cross) it's a bad idea to feed him then take him for a walk immediatly afterwards (ideally wait 2 hours) as it can cause the stomach to twist, and this can be fatal for the dog within half an hour. It's due to the movement of the dog and the movement of the stomach digesting the food. Apparantly dogs with large rib cages (whether they're Wolfhound or Daschund) are at danger of suffering this ailment and I wondered if any owners of these breeds knew about it? Apparently it's the most common cause of after hours veterinary emergency, at my local vets at least. Although, having said that, my dog has been fine for 7+1/2 years.