U.S. federal law recognizes an animal as a service animal once it is trained to perform tasks that mitigate the disability of a disabled owner, without regard for how that animal got trained. It is therefore possible to train a service dog without a license. However, in some states only licensed trainers from recognized programs are afforded the same public access rights as people with disabilities with fully trained service dogs. Consult your state's Attorney General for information on whether private trainers have public access rights for training. If not, you may only train in facilities that have given you permission.