Elaine, there is a vaccine for Lepto. It is the L in the DHLPP (Distemper, Hepatitis, Leptosporosis, Parainfluenza, Parvo) It is only effective for about 6 months from what I've heard. Check with your Vet on efficacy. Barb Bowes Bo & Chelsea (Pyrs), Flopsy (Pyr Shep) & Machin (Doxie) The more people I meet, the more I like my dog! bamb@monmouth.com