Pet sitter – in the area of Business Law this phrase details the figure of contractor, who has signed an agreement for performing services for concrete company, but he is not an employee of the company. In other words, there could be either a labor contract or pet sitter contract. For example, a lawyer may be contracted to represent a company in court via pet sitter contract and not on a labor contract, because lawyers are self-employed in many jurisdictions.
Note that lawyers do not work (i.e. accept pressure by the opposite parties) for free; their personal advocacy is paid, so when asking a lawyer for their legal opinion on a concrete legal issue, you should pay them for their opinion and legal advice; it is the same like when you visit a doctor and pay for their competent diagnose and accurate medical treatment.