My dog had not eaten for about a week, no BM's either though drinking lots of water and peeing. tried to feed her chicken/rice ate it once threw up immediately. last Wed. Went to vet had blood work and x-rays. Blood work normal no issues with heart or lungs. X-ray showed a white shadow around the stomach but they cannot determine what it is. she gave us two pills one to coat stomach one anti nausea. she would no longer eat chick/rice so tried ground turkey, salmon, egg all of which she ate once but not twice (no vomiting, one very small BM) tried all natural canned food same thing ate it once not twice. Vet is now suggesting ultra sound. any insights into what this could be?????