Allie,our black lab,does not vomit at other times. It only has occurred the last 6 days and it is always after eating -about a half hour later. Today it might have been sooner.She is not heaving up the food . It just comes out easily in a heap.The vet did not do any blood work or didn't test the fecal matter. He did a heart worm test and did an xray.She currently isn't on any meds. She weighed 73 pounds which was just down 2lbs from her previous doctor's visit.She does not have any pre existing problems.