again, though, Emotional Support Animals are not recognized by the ADA. Even if the animal has additional trained tasks to meet the "service animal" requirement, per the Dept. of Justice, only DOGS can be service animals.
Some states, such as CA, have more lenient definitions and will allow almost any species to be a service animal. If you leave CA, though, you loose all rights to take any non-dog service animal in public.
ETA:
Federal Register
Published September 15, 2010
Effective Date March 15, 2011
Signed by Attorney General Eric Holder
July 23, 2010
Final regulations
Revised definition of “service animal.”
“Service animal means any dog that is individually trained to do work or perform tasks for the benefit of an individual with a disability, including a physical, sensory, psychiatric, intellectual, or other mental disability. Other species of animals, whether wild or domestic, trained or untrained, are not service animals for the purposes of this definition. The work or tasks performed by a service animal must be directly related to the handler´s disability. Examples of work or tasks include, but are not limited to, assisting individuals who are blind or have low vision with navigation and other tasks, alerting individuals who are deaf or hard of hearing to the presence of people or sounds, providing non-violent protection or rescue work, pulling a wheelchair, assisting an individual during a seizure, alerting individuals to the presence of allergens, retrieving items such as medicine or the telephone, providing physical support and assistance with balance and stability to individuals with mobility disabilities, and helping persons with psychiatric and neurological disabilities by preventing or interrupting impulsive or destructive behaviors. The crime deterrent effects of an animal´s presence and the provision of emotional support, well-being, comfort, or companionship do not constitute work or tasks for the purposes of this definition.”
------------------
also, unless you have been declared LEGALLY disabled, there is no "service animal" under the law. There is a difference between "medically disabled" and "legally disabled" as well.