I did a little research into that, because I wanted to be able to take my Golden Retriever into nursing homes. In the US there are complicated rules. Basically unless you are blind or deaf and have a nationally-certified dog, it does not qualify as a service animal. There are other categories of training you can put a dog through, such as Therapy Dog (which is what I'm going to do one day), but the laws are such that even a certified Therapy Dog cannot go into places Guide Dogs can, such as airplanes and restaurants.
There are people who are working on changing this, but as you know, the US is slow to change anything.