Your vet is not very thorough and is making a lot of assumptions. How does he magically "know" it's a virus, as opposed to a bacterial, infection?

If it were my pup, I would have given it TMZ or Tylan, as both are good for bacterial bronchial infections. If either of the drugs worked, great. If the rattle was still going on I would then get an xray of the heart to rule out a congenital heart defect.

But what I wouldn't do is be totally irresponsible and send a pup with an unknown problem like that to a customer in another country. That is your responsibility to completely resolve that problem before sending the animal.

Good luck,

Jack