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.

What's your worst ESA / service animal story? 

I've heard that neutered males can also do it but it is much more rare.If you're open to it - require vet documentation of spay/neuter, and charge an additional animal rent, maybe 20 per animal per month.Good responsible pet owners are often good responsible tenants.

The barking dog, she asserts, is a visiting animal belonging to her boyfriend.

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

(2) Does the person making the request have a disability-related need for an assistance animal?

@Demetri T.I'm no lawyer like you are, but I don't think "companion animals" get the same protections as service animals.

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

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

Reasonable cleaning costs would include the cost of such things as eliminating flea infestations left by the tenant's animals, cleaning the oven, removing decals from walls, removing mildew in bathrooms, defrosting the refrigerator, or washing the kitchen floor.