Per this article from a couple years ago, it sounds like most renters insurance covers their animals and damage their animal may do to person or property, but you need to confirm that have it to protect yourself.And as @John Lenhart mentioned, adding rules and fees to keep common areas clean and tidy are well worth it.

Cat allergies are generally more common/severe, and the urine can ruin a place.

That way you will be ready to go (and hopefully avoid common missteps) as soon as you have cash to invest. 

Anyone who doesn't have the common sense required to keep their tenants safe from death ought not be in this business.Go pour yourself that bourbon and think that last statement over.Maybe you should get evicted from this business before you kill someone.

This is an old house in NJ and is common in the homes.

@Steve Balinski - you mention that you (sic)listened to MANY BP podcasts.....what is possibly the most common theme with the various guests?

Is this common? 

In most parts of the Baltimore metro area the water bill must remain in the name of the owner.It is common for tenants to pay the water bill, but is the owner's responsibility to collect water reimbursements. 

We’ve seen most cases from people who are defying common sense: beaches, Mardi Gras, other large gatherings, as well as direct contact within family units.

Common laundry rooms.