Thought I'd share this recent experience.  Over the Christmas holiday I traveled to VA with my miniature dachshund, while my other two dogs went to the pet sitter.  While in VA. a dear friend got a foster dog she was evaluating with the intent to adopt him.  She pet sits in her home and wanted to make sure the dog, a big Lab, was compatible with that situation.  The dog had been taken from a high kill shelter in S.Carolina and driven to VA,  where my friend met the dog and the rescue people.

I put off seeing the dog as I did not want to expose mine to him, but broke down after 8 days as I was to return home and figured we were pretty safe by then.  On my return home, after a couple of days, my friend informed me the dog was quite ill with a respiratory virus, as was another one of the dogs she had been pet-sitting.  Within 10 days of the initial exposure, my doxie came down with it also.  I was worried about my other two dogs, especially my 13 yr.old one and decided to try giving them a homeopathic flue preventive " Oscillococcinum " which I and other family members  have used, over the years, with success, to prevent colds or flue, if taken early on.  I figured I had little to lose.

I gave the dogs 3 doses, approximately 12 hrs. apart ( away from meals ).  5 or 6 granules each in the mouth.  Neither got sick and, by now a good three weeks have gone by, so I am passing it on. Can't be sure this is what did it, but it's worth a try if you have a dog who has been exposed to a respiratory virus.  Oscillococcinum is available at any heath food store and totally safe.