The school director didn't pay a dime for her treatment.The doctors chopped her voicebox out and she couldn't speak.

One of my tenants was a severely disabled, retired doctor that couldn't lift her head up to look in her kitchen shelves or drive a car.

We put her in a vacant unit and helped her move into it, and paid a doctor bill of around $50 and bought her a new rug, which she claimed was ruined from plaster dust.  

For animal urine smells, I recommend one of the enzyme based sprays, such as Rug Doctor Platinum Urine Eliminator.

He has since added doctors / attorneys / etc as clients to manage their properties.

Greg S. has a good point about requiring the animal be certified and that you receive written proof from a third party professional (medical doctor, psychiatrist/psychologist, social worker) if the need for such an animal is not apparent and connection is not obvious to someone unfamiliar with the applicant and the animal.

His doctor prescribes John a dog to help alleviate some of his symptoms.

Only a prescription by a doctor.

Today she walks in my office, gives my assistant a note from her doctor that she needs an animal and turns away without saying anything to my assistant.I am pretty annoyed at this but it seems like my hands may be tied and I will just have to accept this animal.

I'm not sure but probably not.You can ask a tenant for written confirmation from a doctor stating they have a disability and require a service dog, but that is about it.