An emotional support animal is more in demand because of its very helping services. There is a difference between true service dogs and service animal letters provided by a doctor or psychologist.  This service letter acts as the only legal source of protection for your pet as an emotional support animal and allows for service animal travel on planes. To get your ESA Letter Online, all you need to do visit our site here https://www.pdscenter.com or via call at (800) 925-2182.