Verkkoat what age can kids start pet sitting? There is no set age at which children can begin pet sitting, as maturity levels and responsibilities vary greatly. Verkkocalculate how much you need to start. On average, the initial capital needed to start a pet sitting business can vary significantly, ranging from as low as. They can start by offering their services to friends, family, and neighbors, and by utilizing online platforms and social media to promote their services. How to start a profitable pet sitting service business. Pets are an important part of our lives.