http://64.23.52.210/articles_L1_11.html http://www.veterinarypartner.com/Content.plx?P=A&A=1588
I don't know why your vet gave it at all unless it is a severe problem in your area. It is a risky vaccine when kidney failure could be a side effect. For the record, I like veterinary partner's list of disadvantages to the vaccine but I don't necessary agree with their reasons to give it. There are very few good reasons to vaccinate against this disease.