Hi, am worried as I've just realised my 7 year old dog's annual booster was due in April 2011 - so am 2 months overdue - am now worried that he'll be at risk - any vets/nurses out there that can advise/reassure me? Am usually spot on with that sort of thing, but for some reason had June in my mind and only just realised when I got his record card out - appt has been made for Thursday! Thank you.