Think of all the things that could go wrong and see if the lease addresses them: unauthorized pets or tenants, early termination, security deposit, lease violations, late rent, eviction, lawn maintenance, parking, etc.5.

No extra rent or pet deposit can be charged. 

The property she lives in herself is in complete disarray and quite literally falling down around her, she is also a hoarder with pets so the place is a disaster and needs to almost be rebuilt from scratch.

Think of all the things that could go wrong and see if the lease addresses them: unauthorized pets or tenants, early termination, security deposit, lease violations, late rent, eviction, lawn maintenance, parking, etc.5.

I could offer her to bring the other cat as well and then be able to charge a pet fee and a deposit? 

I know many charge a pet fee + pet rent, but often that does not always cover the damages that could be caused by an animal.

My question is, since service animals are not considered pets according to American Disability Act, do applicants have to provide some sort of written proof that these animals are legally considered service animals? 

Yes or No (circle one) I have paid a non-refundable pet fee in the amount of ______________ Yes or No (circle one) I pay a higher monthly rent due to my pet(s) in the amount of _____________13.

Also, do you find it better to have an upfront pet fee or a monthly pet rent?

Then I also charge $25/month per pet in pet rent.