I'm sorry if this posts twice or if it shows up somewhere else, I'm still getting used to this site, anyhoo here is my post again (not sure where the 1st one went).
I received my pup from D&S Kennel, here is a link to their website
www.littlepups.net. They have really good information about this topic on their resources page. They were also very informative and good about requesting that I give my pup nurti-cal every 6 hours to prevent an attack. My little guy is perfectly healthy and never came close to an attack (thank goodness). I hope their information helps you as much as it did me and informs you about hypoglycemia.
I agree with John, I wouln't get your pup through the breeder you mentioned if it seems they're showing signs of hypoglycemia because it's something that can be avoided and shouldn't happen (unless it's a chronic case), especially when with the breeder. Good Luck!