It is gross to have rats in your house.
Bob's old dog passed away months ago, and he begins to miss having an animal around.
Bob wants animals at his house again.
Bob goes to the local animal shelter and finds a suitable dog to adopt.
Bob intentionally leaves food and trash strewn about his house in order to attract rats.
Bob takes his new dog home and is happy to have a loving pet again.
Hordes of rats take up residence in Bob's house which quickly becomes disgusting and unsanitary.