Top-paying side hustles require specialized skills, experience, and have high demand.  Dog walking through apps like Rover or Wag can earn up to $43 per hour. Freelance design can bring in up to $32 per hour, freelance writing can yield up to $28 per hour, while freelance proofreading can fetch up to $40 per hour.  Keep in mind that your actual earnings may vary based on factors like location and client base — consider your costs before selecting the best side hustle for you.