My guess is that if someone has been evicted in the last 2-3 years they are pretty likely to repeat that behavior again, or at least be something to be cautious of. 

Thanks for the feedback thusfar.Just as a bit of information, between her and her husband they make about $65K per year, so it is clearly not a case of not being able to afford $600 a month.I guess I really threw up a red herring with some of this information;  what I'm really wondering if this is acceptable behavior for a tenant? 

What do the current landlord and the prior landlord say about their behavior as a tenant?

It's quite different when a tenant without a pet brings one into the picture; you have no way to evaluate the behavior beforehand.

These are not dirty words-- embrace them.While it’s most important to be happy, however you choose to run your business, I personally believe this behavior also maximizes profits.

You'll learn a lot about animal behavior and how people behave. 

However, with that being said with the situation of the windows it’s a behavior although there are several indirect ways to address!

I suspect the behavior has been that way since they were children and were never taught any different.

Monitor each tenants and their behaviors and see if you receive complaints and about any the tenant from the other tenants take heed and that will guide your decide with who you will have to get rid of.

This is absurd behavior on his part.