Thinking outside the canine box when it comes to service animals, from Newsday.com:
...Training a service cat can be more challenging than your average golden retriever. "Cats are a harder package to put together," Knowlton concedes. "You have to get one that's not afraid of anything, and who will listen. And she needs to be unobtrusive—if I bring Pushette to a restaurant, she needs to stay in her basket," which is attached to Knowlton's motorized wheelchair.
Read the full article Newsday.com here. You can also find lots of goodies on clicker training cats at this page.
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Cats as Service Animals
I think cats could be trained for this, but I think getting the public to endorse it will be more difficult.