The emotional Support Animal Letter(ESA) is an official document that can be offered by a licensed therapist or mental health professional in United States. This kind of letter indicates that an animal is medically helpful to the owner. To prescribe an ESA letter California, a doctor or therapist should be keen to verify that somebody has a provable disability. Then, the person can be eligible for particular protection offered by the US government. Emotional support animals are defined by federal and state rules. According to U.S.