So, what is Leptospirosis vaccine? Just like any other vaccine, the Leptospirosis vaccine takes either dead or damaged strains of the Leptospirosa bacterium and injects it into your dog.
Your dog’s natural immune system will then create antibodies that it will use in the future should she ever become infected again with that bacteria.
At the moment, Leptospirosis vaccines prevent infection for around 12 months. This means that your dog will need to be vaccinated once a year if they are at risk of infection.
However, do bear in mind the fact that Leptospirosis is not caused by any one strain of bacteria. Because of this, no vaccine is 100% effective.
Really, the only person who would know best whether your pooch should get the Leptospirosis vaccine is your dog's vet. If this is a real concern for you, then you should make an appointment soon to discuss it.