My 7 month shih Tzu has vomited twice in morning in past 4 days. We are giving Rantac before food and Metrogyl after food twice a day 1 ml each. This morning we again saw white foamy vomit in his bed and gave the rantac. Afterwards he is not eating anything but drinking water. His stool is normal and so are his activities. We tried giving pumpkin, curd and his treat biscuits but he just puts in his mouth and then out. Should we be worried?