I already have a police clearance, do I need another one to be able to do house sitting?

I already have a National Police Check, will PetCloud accept that?

No sorry.  But your Employment Service Provider may pay for a new Police check for you.  It takes an excessive amount of Administrative time and money to review the validity of Police checks obtained from other sources, so in order to keep our service fees low, for this reason, we no longer accept Police checks from any other source other than National Crime Check issued first hand.  You will not be able to re-use a background check from another organisation. 

Go to https://www.petcloud.com.au/verifications Click on "Verifications all Sitters and Walks must have" Then click the button "Get Police checked" You will then be redirected to National Crime Check. PetCloud will be informed programmatically of the result (eg. 'NDCO') If you have no disclosable court outcomes, you will be able to proceed with publishing your listing on PetCloud.
Notes

Your Employment Service Provider (ESP) such as WorkSkil Australia may pay for your Police check. Please ask them. You will be referred to an ESP by Centrelink.