Here is a wonderful LONG list of tasks a dog can be trained for in order to help mitigate psychiatric disabilities:
SERVICE DOG TASKS for PSYCHIATRIC DISABILITIES
It was written up by Joan Froling, Trainer Consultant, Sterling Service Dogs. The author of the It's Not Mental book talked about her and the use of such a dog (psychiatric service dog / medical assist service dog), even adding some to that list because of what the dog ended up doing for the child in the book. There were articles about the use of service dogs for a child with autism and a child with hallucinations and such in an IAADP newsletter years ago. These dogs were trained to "help mitigate disabilities."