Service Dog: Wheelchair Assistance Dogs
Job: To assist their partner by retrieving dropped objects, opening doors, retrieving the phone, helping with transfers or anything else their partner may need.
Handler: Is in a wheelchair. May or may not be ambulatory at times.
Gear: No special gear required, but many wear a special harness to assist in pulling a chair or opening a door.
Notes: Wheelchair Assistance Dogs can vary widely in trained tasks and actual job.
excerpt taken from http://www.anythingpawsable.com/types-of-service-dogs