[blpipers]

I bought my corgi Odie, about 8 months ago.....when I bought him, he was fine. After having him a month, he started scratching, chewing and losing hair. I took him to vet. Vet said it was flea allergies(however I use frontline plus on all my dogs)....he still did not get better. I took him to another vet. Vet said he had demodmex mange and that I should not use him as a stud dog. He had the treatments....still not better. I have tried almost everything! He also has whats called " reverse sneezing" is this common in the breed? i don't know if I should breed him or not. My other corgis are fine and all 3 have run of the house and yard.
If anyone has any idea on what's going on or something else that I can try....please let me know.
Thanks