There aren't true standardized credentials for service animals. ADA doesn't have a standard, so for the small dog there is sometimes a problem. People tend to think they are pets being passed of as a service animal - I've seen it happen. As for small dogs, therapy dogs aren't protected under ADA whereas a small seizure dog, hearing dog, etc., are protected.
I received my service dog, Maggie, through the Veterans Administration. I have major orthopedic injuries and nerve damage from service connected line of duty injuries. Maggie helps me with mobility issues. The VA has or had (I don't know anymore) a contractor in Colorado that did the training. Her training took about one year. I spent a couple weeks there being matched up and trained with her prior to bringing her home. They look for chemistry and compatibility between the dog and client. I wanted to take them all home...
Side Note: I spent my first years in the military training narcotic detection and explosive detection dogs for the military and government agencies. In other words, I started my military career with dogs and ended it with a dog. My wife and I do some dog training on the side...
My Bio:
www.JimMorris.net
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