The buyer was paying on time so there was no way I was going to foreclose and take back in a horrible market. 

Because even if they stay, they will most likely make your life miserable.I took over a building that had been horribly managed by one of the owners (old guy who didn't need the money), who had let tenants get way behind on rent, hadn't raised the rent in years, yatta yatta.  

This is a horrible idea.

By comparison it seems several times a year I see stories of a Pitbull that horribly attacks or even kills someone.

They're not horrible, but I think that's what keeps WC so much more expensive.  

Plus, what if they do a horrible job, and it costs you a bunch of money to un-do it?

LOL.They might not be a horrible choice.  

Cats are horrible .

Especially a place that wasn't a tiny apartment in a noisy apartment building.The one I moved into and rented, was a horrible pink color inside.  

First let me say, that you can first screen these guys, including the disabled guy, and if they don't meet your criteria, you don't have to deal with the service dog issue at all.The service dog issue isn't horrible, though, if you know the laws.You can deny this dog.