I am also well versed in landlord tenant law to the point that I have corrected real estate attorneys on a few occasions.The problem is that I am in the legally flawed state of Massachusetts which lacks a rent escrow law and has a sanitary code that is easy for a "professional" tenant to abuse legally.

We also constantly remind tenants to keep their spaces sanitary to avoid attracting rodents. 

@Paul HolthamThey got involved through a sanitary inspection. 

I'm going to assume the lease wasn't something that was drawn up on the back of a dinner table napkin.

They bought a community with undisclosed sanitary problems that was on city services.

Back of the napkin numbers look decent but if this is in the wrong part of town it is probably over valued and more of a c- D+ property

Your lease could be written in such a way that you have the right to force the remove of the pet for sanitary reasons or property damage.

@Noah Farley From napkin math, looks like $735 a month in rents.

You wont be able to impress investors with napkin math until you have experience under your belt to prove they you know how to estimate accurately enough.

That includes (but is not limited to), paper towels, sanitary napkins/tampons, flushable wipes, diapers, paper towels, fish, or smoking materials/ cigarette butts, or bandages.