Keano has had a cold since I got him. He was on clavamox (sp?) for a week and didn't get better. I took him to the vet on Saturday and he got a vaccine of Convenia which is an antibiotic that should be good for two weeks. I've done some research on the drug and everyone seems to be saying it's for skin abrasions, not respiratory infections. Why would the vet suggest this then? He's sneezing like crazy, has a stuffy nose and goopy eyes. I've had him for 20 days and he still has this cold. Should I be worried?