I just went through closed to the same thing with my golden. It was gorture for me not to have him home, but it was for his own safety. They did do the barium test on him and he had X-rays done every six hours. There was something in the lining of the stomach but it was never determined what it was. He came home and was on a special diet for a few days and was fine after that. It was definitely odd.
Misty- Samoyed Mix, Tannor- Golden Retriever CGC
Robyn- GSD CGC, TC, Midnite-GSD CGC,TC, Brennan-Golden Retriever CGC, Batman-Husky/Greyhound , Apollo-GSD