I'm not trying to get into a pissing match with you KimT. There really is just no where that a service dog can be registered. It would be good for those who have service dogs if there were such a national registry in which one had to truly prove their dog was service dog trained. There are many fakes out there that make it difficult for people who have trained service dogs when out in public. Those are the dogs that have vests on, which anyone can buy on the Internet, but have terrible behavior in public - barking, not paying attention to the handlers cues, being generally disruptive - a national licensing would go a long way to reducing the fake service dog problems.
It's great that you were able to train your dog to help you and to be all that a service dog can be. A very good friend has done the same. It's not something we could ever do which is why T went through a program in which that's specifically what they do - train service dogs.
The worst issue that happens in public regarding T's service dog is that everyone wants to pet and talk to her. People do not like it when he says no. He says no because it is unfair to her and the work she is doing for him and unfair to him because he could get hurt if her attention is taken off of him. He still can walk short distances. If she paid attention to others in public instead off him she might pull too hard on the leash and he could fall. Fortunately he doesn't care if someone's feelings get hurt because he says no to them wanting to touch/talk to her and fortunately neither does she. They work well together. They are crazy about each other. Most of the time the public is respectful but we definitely have our stories on those who have been intrusive and rude.