I have already warned them about violating the pet policy.

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 have a no pets policy.

I could charge a per pet fee to add to my bottom line per month and collect a pet deposit upfront incase of damages. 

"90 gallon aquarium"$200 pet deposit*......

What is everyones take on pet deposits?

A lot of guests also like having fenced in yards for their pets. 

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.

It is not easy, but we are pet owners and it is something we want to allow our tenants to experience.However, we have had some instances where the tenants do not pick up dog waste in the backyard.

In addition to talking to your landlord and putting out poison (assuming you don't have pets or kids), make sure you aren't leaving food out.