The SF SPCA's former Academy for Dog Trainers Program offers lists of professionals (in California, across the United States and Internationally) who have gone through their rigorous training.
See resource list below.
dogTEC
dogTEC is a full-service business and marketing support organization for the dog pro industry. Choose from below to download a list of qualified dog trainers, dog walkers, pet sitters, dog daycares, and dog boarding facilities across the country.
http://dogtec.org/referral-list.html