To qualify for an emotional support animal in California, you need an ESA letter from a California-licensed mental health professional. Three templates for service dog letters from healthcare professionals, covering the types of letters service dog users may legally need.Can a landlord require documentation for a service dog California? No, landlords cannot require documentation for a service dog in California. A landlord cannot deny an emotional support or service animal due to the breed, size, or weight. We only accept Credit Cards at this time. If you have a service animal (dog or miniature horse), there are more legal limits on what a Housing Provider can ask. The ADA makes a distinction between psychiatric service animals and emotional support animals.