A great mobility scooter for a person with dwarfism would be:
Invacare Colibri Mobility Scooter.
These are lightweight, easy to use and can be adapted to make them more suitable for a person with dwarfism.
For more information on scooters, please contact Chris Elliot at CEA Mobility.
His information can also be found on the Equipment advice page of this website, to visit the page click here.