http://www.dailymail.co.uk/news/arti...ine-feces.html

A couple in Colorado looking to sell their dream home were horrified to discover that their property was nearly destroyed at the hands of a prospective buyer.
'I mean, there was just no words… the feces and the urine spread all over our white cabinets, all over our hardwood floor, it was even on the ceiling – 10-foot ceilings,' said Jenny Fisch, the homeowner.
Late last year, Jenny and Paul Fisch put their El Paso County home on the market for $450,000, according to Fox affiliate KMGH 6.
More at link.

I would never, ever, ever "rent" a home to prospective buyers. That takes 3 months of potential buyers out of the equation and opens it up to exactly what they experienced.