 After learning about Mr. Burns ' plan , Bart and Lisa sneak through the window and attempt to escape with the puppies down a laundry chute using Bart 's socks . However , Mr. Burns is waiting for them at the bottom . As Mr. Burns is about to kill the dogs , Bart grabs Little Monty from Mr. Burns ' hands and places him with the other puppies , hoping that Mr. Burns will not kill the dogs if he can not determine which is Little Monty . When Mr. Burns tells Little Monty to stand up , though , he does . As Mr. Burns bends down to pick up Little Monty , Bart reels a clothesline with some socks hanging from it , causing all of the puppies to stand up . Mr. Burns can not tell which is Little Monty , so he prepares to shoot them all . However , the standing dogs are too cute for him to kill and , emotionally touched , he promises to never wear fur or kill any animals that can do an amusing trick . Mr. Burns buys all of the puppies from the Simpsons and successfully raises all of them into world @-@ class championship racing dogs , winning him millions , to Homer 's dismay over the Simpson 's missed fortune @-@ making opportunity . 
