First and foremost you should tell the owners you sold to about this new info. Offer to give tbeir money back and take the pup. ( most likely they will refuse because they love them already) and then give them info on how to deal with it. Daisy had a liver shunt, and I found that switching her diet to 14% crude protein, stopped the symptoms, and she had to take medication for her UTI. She's better than ever now!
btw, the food she's eating can be found ina ll pet stores: Nutra Lite. It's a brown bag...ever since she's eaten this..she has done So much better and she went back for a blood test, adn she was fine. no shunt.