Skymall sells a kit for do-it-yourself service animal certification. Check out their self test criteria.
http://www.skymall.com/shopping/deta...&pid=204351645
Some people have no shame, and this kind of crap simply makes it harder for the truly disabled.
In addition, different airlines will have their own rules that complement federal transportation rules regarding transportation of animals. Larger pets normally have to travel in the aircraft’s hold for a fee. However, service animals regardless of size are permitted to travel in the aircraft cabin, sitting with their handler. Most airlines will not charge an additional fee.