And, while that might have been worth discussing had they approached you as "adults," they chose to financially harm you. 

Until the landlord brought documentation, thanks to their due diligence, that service animals protect the person they are with, are well-trained, and would not cause harm by breaking loose.

@Tori Parker  @Kris Taylor  & @Alberto Artasanchez make good points...be listed as occupant and be prepared to have your credit ran...If you feel it is going to harm the situation...then let them know up-front and explain your credit situation...Most people in this country have had some rough credit bumps in the last few years...The biggest concern of the landlord is getting paid their rent, and making sure they are renting to good tenants that will take care of their property.So when righting a letter explaining your situation don't try to make excuses or place blame on other people for credit blemishes, but explain what actually happened, and how your situation has improved now so you won't have this same issues going forward.In most situations they will appreciate you being up-front.

Not scared at all because I dont fit the “demographic” that would be harmed.

I can’t prove the cat died from toxicity but even putting a pets in harms way is completely unacceptable.Are there grounds for non- renewal of lease even if toxic traps as a prohibited item were not on the contract?

So As @Jim K. mentions weaving this dream in these asset class's can really harm investors that dont know what they dont know. 

We don’t know any PMCs to recommend in the area mentioned, but since selecting the wrong PMC is usually more harmful than selecting a bad tenant, you might want to read our series about “How to Screen a PMC Better than a Tenant”:https://www.biggerpockets.com/member-blogs/3094/91877-how-to-screen-a-pmc-better-than-a-tenant-part-1-services-and-processesEven if someone give you a referral, don’t make the mistake of assuming the PMC will meet your expectations, just because they met the expectations of the referral source.We recommend you get management contracts from several PMCs and compare the services they cover and, more importantly, what they each DO NOT cover.

We don’t know any PMCs to recommend in the area mentioned, but since selecting the wrong PMC is usually more harmful than selecting a bad tenant, you might want to read our series about “How to Screen a PMC Better than a Tenant”:https://www.biggerpockets.com/member-blogs/3094/91877-how-to-screen-a-pmc-better-than-a-tenant-part-1-services-and-processesWe recommend you get management contracts from several PMCs and compare the services they cover and, more importantly, what they each DO NOT cover.

We don’t know any PMCs to recommend in the area mentioned, but since selecting the wrong PMC is usually more harmful than selecting a bad tenant, you might want to read our series about “How to Screen a PMC Better than a Tenant”:https://www.biggerpockets.com/member-blogs/3094/91877-how-to-screen-a-pmc-better-than-a-tenant-part-1-services-and-processesWe recommend you get management contracts from several PMCs and compare the services they cover and, more importantly, what they each DO NOT cover.

(Again, ultimately harming tenants.)The number of single family rentals will decrease as rental homes are sold to owner-occupants in this hot market.