@Jerome Hawkins The first step is to try to get an accurate read as to why it's not selling.I think it was Brian Tracy (sales trainer) who said "prescription without diagnosis is malpractice."

Per Federal law, it is absolutely illegal and no prescriptions can be written for it.

If they can show medical bills, prescriptions, or something PRIOR to contacting you, then you may want to let them go to avoid any issues.2.

In Florida, Teen killed in motorcycle accident  ( highly suspect that his plan to claim on insurance went awry and strong prescription painkillers involved).Single person occupancy and he was the only person on lease.He was in the midst of moving out, but left behind starving animals, drug paraphernalia, junk.Now multiple strangers are driving around and selling off his 6 vehicles and have been staying in the house after his death. 

Yet, people choose to take prescriptions that cost hundreds of dollars a month to alleviate the condition rather than cure it.

It's time to talk to a Kentucky property law attorney about easements, prescriptive, by necessity, etc.  

Assuming there was no simple typing/scrivener’s error, then making a deal with the neighbor seems like the only solution.....maybe a prescriptive easement.

Some websites sell "certification" for support animals not issued by a doctor, BUT there are now websites with actual doctors selling service animal prescriptions, and legally we must accept them.

They just informed me that their son has been diagnosed with autism and the doctor gave them a letter/prescription advising that he have a "comfort dog". 

They get a prescription for the service animal and then never go back to the doctor.4.