If an individual is convicted for an animal cruelty offence, the offence will show up as a disclosable court outcome (DCO) on a police check. 

If this is the case, they will not be able to pet sit your pet through PetCloud.

If they haven't been caught yet, or if the RSPCA chose not to refer, or a Magistrate chose not to record the conviction, you won't know.

Police & Inspectors do record "Person of Interest" notes which are in their private database which the public do not have access to.

Referring Authority (Police or RSPCA) sends the matter to a Magistrate who then decides level of seriousness & decides whether initial evidence is sufficient to go to court.