Under the Ontarians with Disabilities Act, O. Reg. 191/11, Section 80.45 provides the following definition of Service Animal and we would use this as a means to identify and confirm for the purposes of licensing:

4. For the purposes of this Part, an animal is a service animal for a person with a disability if,
   
   1. the animal can be readily identified as one that is being used by the person for reasons relating to the person’s disability, as a result of visual indicators such as the vest or harness worn by the animal; or
   2. the person provides documentation from one of the following regulated health professionals confirming that the person requires the animal for reasons relating to the disability:
      1. A member of the College of Audiologists and Speech-Language Pathologists of Ontario.
      2. A member of the College of Chiropractors of Ontario.
      3. A member of the College of Nurses of Ontario.
      4. A member of the College of Occupational Therapists of Ontario.
      5. A member of the College of Optometrists of Ontario.
      6. A member of the College of Physicians and Surgeons of Ontario.
      7. A member of the College of Physiotherapists of Ontario.
      8. A member of the College of Psychologists of Ontario.
      9. A member of the College of Registered Psychotherapists and Registered Mental Health Therapists of Ontario. O. Reg. 165/16, s. 16.

Further it refers to the Blind Persons Rights Act for the definition of Guide Dog which is as follows in Section 1: “guide dog” means a dog trained as a guide for a blind person and having the qualifications prescribed by the regulations. (“chien d’aveugle”) R.S.O. 1990, c. B.7, s. 1 (1). The information under O. Reg. 58 states the following:

1. A dog that has successfully completed the training program at any of the following facilities is qualified as a guide dog:
   1. Eye Dog Foundation for the Blind, Los Angeles, California.
   2. The Seeing Eye, Inc., Morristown, New Jersey.
   3. Guide Dogs for the Blind Inc., San Rafael, California.
   4. International Guiding Eyes Inc., Hollywood, California.
   5.  Eye of the Pacific Guide Dogs Inc., Honolulu, Hawaii.
   6. Leader Dogs for the Blind, Rochester, Michigan.
   7. Guide Dog Foundation for the Blind Inc., Smithtown, New York.
   8. Guiding Eyes for the Blind Inc., New York, New York.
   9. Pilot Dogs Inc., Columbus, Ohio.
   10. Guide Dogs for the Blind Association, Windsor, England.
   11. Canadian Guide Dogs for the Blind, Ottawa, Ontario.
   12.  Canine Vision Canada, Oakville, Ontario.
   13. National Service Dogs, Cambridge, Ontario.
   14. Any other guide dog training facility that the Attorney General or an officer of his or her Ministry designated by the Attorney General in writing determines meets the following criteria:
       
       1. The facility provides a minimum of three months of training for a prospective guide dog that involves, in part,
          
          1. exposure to situations in the field, including street traffic, public transportation and the negotiation of stationary and moving obstacles and barriers, and
          2. a minimum of 10 days of training with a guide dog user.
       2. The facility ensures that a guide dog that successfully completes a training program at the facility,
          1. does not demonstrate social behaviour inappropriate to a guide dog,
          2. does not suffer from an ailment, disease or physical disorder that would substantially interfere with its duties as a guide dog, and
          3. demonstrates basic obedience skills with a leash and voice commands. R.R.O. 1990, Reg. 58, s. 1; O. Reg. 649/05, s. 1.

Applicable legislation for excerpts:
Ontarians with Disabilities Act
Blind Persons Rights Act​