Hi, my 4 month old puppy just travelled with me from South India to North India via train and now it's been 2-3 days but from yesterday night he is vomiting yellow liquid, yesterday night he did once and tonight 3 times. doesn't contain any food but only the yellow liquid. Pls tell me what could it be as I took him to vet and he said my pet doesn't have any fever and gave one tablet to give for 5 days once.