We have a Fourteen year old cat who sneezes all the time, nose is runny. We took her to the vet and they did tests on her, and they prescribed medicine for her and we gave it to her and she stopped sneezing, we gave the complete course and all was well. One month after, her symptons came back. We gave her another run of medicine and the same thing happened. Has anyone any advice on what to do the vet does not seem to know.