Hi My Labrador is vomiting white soapy like substance. i have taken him to Vet twice before and the vet gave him antibiotic on both occasion. while he is taking the medican it stops and after the course of medication is over he start to do it again. first time vet told me it was canine cough. can you please help me. i am in a small town in india. and sometimes i fear that he may not be getting the right cure.