28 CFR Part 36 Nondiscrimination on the Basis of Disability by Public Accommodations and in Commercial Facilities NPRM (2008 Title III NPRM)

(4) General requirements.  The work or tasks performed by a service animal shall be directly related to the handler's disability.  A service animal that accompanies an individual with a disability into a place of public accommodation shall be individually trained to do work or perform a task, housebroken, and under the control of its handler.  A service animal shall have a harness, leash, or other tether.