Please make sure they have had testing done on adults, hips, etc. Please make sure the puppies are not 'barn' raised/adults kept in the barn, even though you are told they are inside dogs. Ask to talk with other people who bought their puppies. A life time ago when I had puppies (not mastiff) I would refer past buyers as reference. You are in KY, there is a breeder that talks the talk but hasn't followed thru and is real close to a puppy mill, 3 females and a lot of puppies since we got ours. We have had behavior problems with Snookums, our EM. She was left in a barn stall or cage most of her puppyhood, in litter mess. She was purchased in Elizabethtown, KY. Yes a professional trainer helped, White Fang Ventures or Matt Duffy out of Louisville is excellent. Most of all, visit with your eyes wide open.