Hi and Welcome to YT!
FYI: It is highly taboo to give Lepto to any small breed dog from prior experience/documentation on adverse reactions to this specific vaccine. Any good small breed vet would know this.
Personally, I would stay away from any new vaccines until they have been fully tested on the general public. These include Giardia, Dental vac (friend reported problems with 4 Yorkies), influenza.
I also do not vacinate for Lymes, bordetella, or corona virus.
Further info from this site:
http://www.yorkietalk.com/forums/yor...-overview.html