Dog service companies such as Rover allow you to join as a dog sitter. All you have to do is make a profile and confirm the types of pets you want to care for and the dates that work for you. Would you like to find out more about a retirement side gig and other entrepreneurial topics? Click here to sign up for Chris Carosa’s newsletter and receive a free three-step checklist to determine if your idea has what it takes to succeed. Earnings surprises in the "side hustle apps" niche have consistently exceeded consensus forecasts by 3% over the past four quarters, highlighting underestimated market demand.