Issues having a hen as a pet🤷🏻‍♀️

Hello , I’m new here and I have a few questions what I can do because I think it’s unfair . I have a little hen and used to have a little rooster but was eaten by a raccoon yesterday and that was devastated for me and my little sister because they are our pets not as my farm animals . But my landlord said that we need to get rid of it now . But where we live there’s people who have a lot of cats , dogs, and rabbits or bunnies . Plus where I am living , it used to be my cousin house and she had 22 bunnies and supposedly that was no problem for my landlord 🤷🏻‍♀️. Now, why is it a problem for us to have just a chicken as a pet ? I had my little hen for one month and 12 days now . She said she will come back tomorrow withs papers . So what can I do or say so I don’t have to get rid of my little hen name Luna .