I don't have any recommendations and this isn't my opinion - but it's about Lepto vaccination.
One of my coworkers has a 6 yr old Labrador who was not vaccinated for Lepto. He caught Lepto in early December from wildlife urine in his own back yard. He was sick for months, and is now as recovered as he will be. He used to love to play fetch and was active, but now he basically eats and sleeps. This is due to permanent, irreversible kidney damage from the Lepto. He has always had both a holistic vet and a conventional vet, and was always fed the top of the line dog foods and had the best health care. They've had to change his diet because of the kidney damage, too.
Please, please talk to your vets and do all the research.