I wouldnt pay the bill, any good vet knows (toy breeds)Yorkshire Terriers have very bad reaction to Leptospirosis besides its an extremely rare disease most areas in the country believe is no longer exist.
The Lepto vaccine is the most common shot known to cause potentially serious reactions such as hives, facial swelling, and even life-threatening vaccination reactions much more than any of the other.
read this
http://64.233.167.104/search?q=cache...hl=en&ie=UTF-8