You might want to take a look at this:
Psychiatric Service Dogs... | Service Dog Central
There is a difference between an emotional support dog and a service dog. Beware of the online service dog patches & badges -- is is fraud to pass a dog off as a service dog who can not perform a specific and demonstrable task.
On a recent flight I observed a fuss about a psychiatric therapy dog that the airlines did not allow due to it being an anxiety support dog with no specific task -- such as a seizure dog, a seeing eye dog, a hearing dog, a diabetes alert dog who have demonstrable tasks other than or outside of being a companion.
I have a patient with agoraphobia and the ADA will not stipulate her dog as a service dog -- it is considered a support dog such as a therapy dog.
You might also look at the Psychiaytic Service Dog site. It also has a training program.
Some states, such as California certifies service dogs. PTSD dogs for military folks are having trouble getting certified as service dogs unless they can show a specific task they perform for their handler, other than companionship and emotional support.
There is also talk that the ADA folks are considering re-writing the requirement and requiring service dog training and certification. The service dog training facilities are encouraging this and hoping to get it changed.
Hope this helps.