Rats often represent improper, sneaky, such a bad representative. Dogs, in people's minds, often represent justice, law, honesty and so on. Both animals represent yourself. So the metaphor is obvious: the landlord has been troubled by one thing in his life recently, and there are two ways to deal with it, one is more honest and the other is unfair, and then the landlord has experienced a certain psychological struggle before he has this dream. Given that the "mouse" was finally thrown on the balcony, it should be the right thing to do. Of course, it is also possible that it is because of the improper way in real life that I gave myself psychological satisfaction in my dream.
Argument 2 (less likely): The mouse represents the person who recently entered the landlord's life and is very annoyed with you (more annoyed inside), so you want to kick him/her out of your life and rush to the balcony.