I have not, but you know to think about it, we have only been asked a few times for verification of this. Just in case though, we always bring a letter with us to show they are up to date with there shots and Rabies vaccinations. I think a letter from your Vet stating as to why the exemption was given, would be all you need. I would also have the Vet write in the letter, that Rabies shots were given to your dog until his(her) unfortunate illness. Hope this helps. I also hope your dog is doing much better. We have 2 pugs and I know how difficult it must have been for your beloved animal to have become ill. They are our family, which only animal lovers would know.
David & Annamarie(Fatty & Harley)
2011 Rockwood windjammer(3065)