A cat sitter is a pet care professional that specializes in caring for cats. As a cat sitter, your job involves staying with or checking on the cat while its owner is away, whether just for the day or overnight. Typical duties include feeding, changing water, cleaning litter boxes, administering medication, and providing company. Some cat sitters are self-employed as an owner of their own pet care business, but you can also work through an agency or simply freelance as a second job. This career requires a flexible schedule, professional appearance, and experience working with animals. Clients often prefer those with a list of references from other clients.