Service dog trained by patient

Patient wants a letter for a service dog which is trained by her for 2 years . I have never come across a request like this. I did some digging and looks like no certifications are required. ADA 2010 Revised Requirements: Service Animals The ADA Home Page provides access to Americans with Disabilities Act (ADA) regulations for businesses and State and local governments, technical assistance materials, ADA Standards for Accessible Design, links to Federal agencies with ADA responsibilities and information, updates on new ADA... www.ada.gov How do I know if the patient can alleviate her ptsd symptoms ? Can anyone just point to their pet and say thats my service dog.?
Source: Student Doctor Network - Category: Universities & Medical Training Authors: Tags: Psychiatry Source Type: forums