He's finally back to his old self, bitting our pants,chewing on rawhide and getting crazy in the snow

It's such a relief as I was scared of loosing him this morning quite honestly.
But he won't be receiving any lepto booster for the rest of his life. I feel kind of cheated now that I know that 90% of dogs survive lepto and that most strains are not covered by the vaccine and on top of that, the vaccine is active for 6 months to a year.
Thank you all for answering it's been a great moral support.