If I recall correctly, the vaccine only covers about 4 strains and there are hundreds. Of course, many strains are more prevalent then others, but for me the risk of side effects outweighed the benefits of coverage. Also, there is some question on how often the vaccine needs to be given to be effective. Some sources believe every 6 - 8 months. Taking that and my boys' lifestyle into account, I choose not to give it.
Lepto does scare me though. It can enter through the nose and eyes. An infected dog can shed it peeing anywhere.
Edit to add: many dogs here on YT do fine with the vaccine.
__________________ Kristin, Max and Teddy
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