A professional house sitter lives in a home while the owner is away to maintain the household. During their absence, your duties include caring for pets, tending to indoor and outdoor plants, mowing the lawn, remembering to collect the mail, paying utility bills, and performing general upkeep work. Your responsibilities vary depending on the needs of each client. Some homeowners expect you to operate an alarm system and take other measures to ensure the security of the house. Other homeowners seek sitters who can perform basic maintenance tasks during their stay. Professional house sitters can market their services via websites and agencies.