To get beyond the punches, another thing that you can do to increase the effectiveness of your signs is to ad a website address to them.

Under the ADA, tenants with disabilities are entitled to add safety features and are responsible to remove them and put the property back in the original condition.

Specifically looking at Ada and Canyon counties. 

I'm guessing this is why the law was added, but seems like these would fall under an ADA reasonable accommodation. 

There are a lot of these houses in the Richmond,VA. area.the best successes for residents appear to be the houses with 10 -12 or less per house although,that may not be the most lucrative model.The 4 of us(owners of 10 houses) tend to be involved in at least a biweekly basis.It is very rewarding personally but,tragic in other cases.some of us have had some "push back" from HOA's but, the ADA mention usually quiets them.I would be interested in doing more if I can find the right property.Being on the local bus line is a huge advantage

I'd be inclined to simply not respond to inquiries and remove the ad as soon as it had accomplished whatever I had wanted to test.

ADA: doesn't cover "emotional support animals" at all.

Be sure to comply with the American with Disabilities Act (ADA) and Fair Housing laws.

I am a formidable force to deal with when prospective tenants illegitimately try to use the ADA and other non-discrimination laws to their advantage.

Guide dogs & service animals are covered under Federal ADA.