More about service animals

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In the US there have been court cases where the dog was not considered a trained SD because it in fact had received no training, obedience or otherwise and did not perform trained tasks.

Service Dog central has a good list of case law.

http://www.servicedogcentral.org/
http://www.servicedogcentral.org/content/

The deltasociety.org site has a lot of info, too.
http://www.deltasociety.org/ServiceInformationBasic.htm

http://archive.deltasociety.org/ServiceAccessHousing.htm

And if you're interested in "traditional" tasks, there is
http://www.iaadp.org/tasks.html with a pretty comprehensive list of tasks that can be trained to mitigate a disability-keys being TRAINED and mitigating the disabled persons disability.
Ofgift