Carrie
Thanks so much for your thoughtful words. I am pretty comfortable that they are both immune but I may seek out a vet that will do a titer, just for my own peace of mind. One of the two holistic vets does have a website and from what I've read, I think I would be comfortable taking them to her. At least now I have a plan and can go from there. Thanks again for taking the time to respond. All the best to you!