Then, maybe you can get them out for criminal behavior?

Your behavior can be considered a waiver of the terms in the lease requiring rent on the first.  

You did the right thing.Next time just remember to meet him during business hours.People's behavior is always interesting when it is time to pay for a service, I have stopped assuming things.

To that end, you may request from the tenants that are being disturbed that they provide some documentation of the behavior that has occurred. 

Then you are not open to all pets yet not closing off the possibility altogether....So, for example, one small well behaved dog you may approve  (especially one that a previous landlord says was not a noise, damage or other problem) but a pack of loud unruly ones not so much...And you can refine some of what you are looking for in terms of size, behavior, numbers, breeds, ages (no puppies without house training for me, eg), even spaded/neutered (especially for male cats, etc), references (ie how the owner did with a pet in past places), etc... 

Given enough time and lots of good behavior, she'll be able to eventually improve her situation.

I think that may be my best indicator by far of this specific dog's behavior.

There were expectations of responsible behavior, and consequences for breaches of discipline, and there was always an audience awaiting the outcome.  

This is normal bathroom behavior, in my opinion.Sure, your and I, if we noticed, would wipe up the water. 

Were there really no clues that you would encounter this kind of behavior?