Tenant has a pet, but is not paying pet fee.

[Justin Dighans]

We are aware our tenant has a cat. We have seen it multiple times when we are in the unit for maintenance purposes. Our office has reached out to them letting them know how much our pet fee is and that we need some information on their pet. They have not responded to any of our efforts to contact them concerning this matter. What is the best way to go about getting payment for the pet or having the pet taken away if they refuse to pay?