For the Marines, height standards for male applicants range from 58 to 78 inches. Height standards for female applicants range from 58 to 72 inches. The services have both height and weights standards. If you fail the height / weight charts, but pass the body fat standards you are still eligible for service.
Most dogs require 1-2 years to become a service dog and be fully trained in public access skills. The training cost of working with a professional trainer at $150 an hour would be about $7,200 a year.
There are three basic areas of training for a service dog: manners, obedience with proofing (aka public access skills), and task training. This training typically takes 18-24 months. While a pet may be taken for a walk to toilet, a service dog must be prepared to toilet on command, on any surface.