https://www.wikihow.com/Become-a-Professional-Dog-Walker

David Levin, owner of Citizen Hound dog walking in San Francisco, is a professional dog trainer with over a decade of experience, leading an award winning dog walking company

I helped coauthor this terrific article posted to WikiHow on how to become a pro walker.

Need your SF Commercial Dog Walker permit? We offer one of only a handful of courses here in SF which are required to obtain your permit.

Citizen Hound and SuperDog City have teamed up to offer a 20-hr Classroom, or 40-hr Hands On Dog Walker Certification Course endorsed by San Francisco's Animal Care and Control to satisfy the city and the GGNRA's commercial dog walking legislation requirements.

The SF Commercial Dog Walker Certification Course was co-authored and developed by David Levin and Corey Vitale, owners of two of the most successful and largest dog walking companies in the Bay Area.

http://www.citizenhoundsf.com/dog-walker-certification-course