Hi Bec,
I would do it every year. The reason is that I used to work at the dog pound in the Tweed which is not so far from you. And we would see parvo at least three times a year. It is pretty rife in that area. And I know one of the gold coast dog parks had parvo in it the year that I was there. I was warned not to go to that one. It can stay in the soil for years.
HTH
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