A full plate: cats, clutter, disability issues

Q:  I have been a landlord for many years and usually have been able to rent to tenants who take care of their rental units. But now, one of my current tenants is ruining her unit. She has filled her apartment with piles of clutter, and owns six cats that are extremely dirty. I want to evict her before she completely destroys the place, but want to obey the law..."  More