4 yr old male basset. Has been vomiting for days. Went to vet, ran all types of tests and found nothing. He refuses to eat. When he drinks, he vomits immediately. There is a female basset on premises who is in heat. At the vet he was given antibiotics and anti vomiting meds. He was OK for 1 day…he ate and was not lethargic. Today he is just as sick as when we went to vet. Please help!!! He is very skinny and not acting like himself at all.