I don't know that I can be of much help, but when I first got Ferdinand I didn't know any better to not get Lepto. His first round of immunizatons, which contained Lepto, made him extremely lethargic... and he almost acted drunk - falling over and stuff. His second round, however, he was fine, but I gave him some children's benadryl (as instructed by the vet after describing his bad reaction), and he was fine - no bad reaction. In between his 2nd and 3rd round is when I learned that the Lepto immunization can be harmful. So at the appt for the 3rd set, I told them I didn't want him immunized for it, but they said he already had been as it was combined with another shot.
I'm sure some of the more experienced members here could provide you some more educated insight, but I just wanted to share my experience with the Lepto immunization. Good luck with your little one, I'm sure everything will work out for the best!!
__________________  Britta
...and Ferdinand too  |