I do not vaccinate. My dogs recieve parvo, distemper, and rabies nosodes until they are 8 months old and then I titer annually. I think a few of you don't understand what a titer is -- a titer will tell you if a dog is immune to something, but it won't tell you if a dog ISN'T immune to something. A low titer score does not mean the dog isn't immune -- it just means it hasn't been recently exposed to the virus. My last titer for Visa was very high for parvo (1:400,000), but was very low for distemper (1:3). Parvo is shed in vaccines which means she is constantly exposed to it. Distemper is not, and since it is a rare occurance, she is never exposed to it and therefore titers low for it. The only way to know if she is immune is for her to come in contact with the virus and have her not become sick or to titer her right after she is in contact with the virus. Titers have alot of disadvantages. I use them because the clubs I am a member of accept them and I prefer not to vaccinate.