I include a link to the city's animal ordinance and have updated my lease to include a place for them to initial and acknowledge those specific requirements (which include micro-chipping, leash laws, etc.) 

You can report vandalism, vacant properties, drug dealing, potholes, broken streetlights, derelict vehicles, nuisance properties, loose animals, overflow of trash, etc.

Here is the Seattle definition: “Discrimination” means any conduct, whether by single act or as part of a practice, the effect of which is to adversely affect or differentiate between or among individuals or groups of individuals, because of race, color, creed, religion, ancestry, national origin, age, sex, marital status, parental status, sexual orientation, gender identity, political ideology, honorably discharged veteran or military status, alternative source of income, participation in a Section 8 or other subsidy program, the presence of any disability, or the use of a service animal by a disabled person.

I called my local Animal Control and asked if one had to be licensed and inspected to do so in my county and yes; they do. 

It can definitely be a double edged sword of letting animals into the property and also making sure the owners investment is protected.

I make mention, during the showing, of no smokers/smoking just like no animals are permitted. 

I'm currently in the process of releasing my duplex and I've never been a big fan of having animal in my unit.

How many animals?

You don't get to have a companion animal in your apartment for someone else who doesn't live with you.  

I see this as a way to deal with service animals in the future.