Ken,
She will get blood work done every two weeks to determine how long the shot works, in most dogs it is effective for 4-7 weeks.

frAnk: Thanks for your advice but Lucy is hardly living a life of misery and is quite active. This is 30 days ago after several hours of busting snow chasing late seasons roosters. Pretty sure your fat aZZ could not have kept up with her.

[Linked Image from i.imgur.com]