Pet Sitters International suggests that all pet sitters get insured and bonded to cover expensive accidents - like if "a client's hardwood floors are damaged due to a water-related accident, a pet in her care dislocates its hip, a dog swallows a ball at a dog park and requires surgery," or "a cat overdoses on medication." All of those things would be very expensive if the sitter isn't insured.
All insurance businesses are different, but most will offer a certificate of proof that the sitter is insured.
10. Can you provide a list of references?
The National Association of Professional Pet Sitters has a thorough list of questions to ask references.
Sarah Sypniewski, a lost pet specialist who owns NinjaDog Concepts, suggests talking to as many references as possible.