Sure if you want something done in life you should probably just do it yourself, but not many dogs have been willing to take this advice to heart...until Jesse the Jack Russell.
Most of the things this dog does are standard tasks that service dogs for limited mobility are taught. People in who have difficulty moving around can get dogs trained to fetch things for them (like sodas), performs tasks for them (like putting things away), and open doors and things for them. It's usually a bigger dog, though.