
Quoting
HUD FHEO Notice: FHEO-2013-01
Housing providers may ask individuals who have disabilities that are not readily apparent or known to the provider to submit reliable documentation of a disability and their disability-related need for an assistance animal. If the disability is readily apparent or known but the disability-related need for the assistance animal is not, the housing provider may ask the individual to provide documentation of the disability-related need for an assistance animal.... For example, the housing provider may ask persons who are seeking a reasonable accommodation for an assistance animal that provides emotional support to provide documentation from a physician, psychiatrist, social worker, or other mental health professional that the animal provides emotional support that alleviates one or more of the identified symptoms or effects of an existing disability. Such documentation is sufficient if it establishes that an individual has a disability and that the animal in question will provide some type of disability-related assistance or emotional support.
However, a housing provider may not ask a tenant or applicant to provide documentation showing the disability or disability-related need for an assistance animal if the disability or disability-related need is readily apparent or already known to the provider. For example, persons who are blind or have low vision may not be asked to provide documentation of their disability or their disability-related need for a guide dog. A housing provider also may not ask an applicant or tenant to provide access to medical records or medical providers or provide detailed or extensive information or documentation of a person's physical or mental impairments. Like all reasonable accommodation requests, the determination of whether a person has a disability-related need for an assistance animal involves an individualized assessment. A request for a reasonable accommodation may not be unreasonably denied, or conditioned on payment of a fee or deposit or other terms and conditions applied to applicants or residents with pets, and a response may not be unreasonably delayed. Persons with disabilities who believe a request for a reasonable accommodation has been improperly denied may file a complaint with HUD.