The Season of Giving: Day 24

Christmas: Sorry, guys. I had a Yorkie bar to give you, but I had to give it to the Cybermen instead.
K-9 Mark 2: Understood. Cybermen threats can terrify the bravest Dalek.
K-9 Mark 3: Inquiry: Why would you give us a Yorkie bar?
Christmas: Well, you two are dogs...
K-9 Mark 2: Robot dogs.
Christmas: And a Yorkie is a type of dog...
K-9 Mark 2: Not a model of robot dog.
Christmas: Hey, I was trying, okay?
K-9 Mark 3: Your attempt demonstrates thoughtfulness and creativity, but apologies are unnecessary.
K-9 Mark 2: They are?
K-9 Mark 3: Sensors detect 14.1 ounces of dark chocolate, far more than in a Yorkie bar. We can put the abundance to multiple uses. We can devour some, use some to make chocolate robot-dog biscuits, and still give a sizable portion to Master's Belgian friend Hercule Poirot.
K-9 Mark 2: The famous detective would like that, wouldn't he?
K-9 Mark 3: We just need a decorative box to put his gift-chocolate in. Oh, and since he's so particular, this time let's make sure it's got a matching top. Otherwise, the present might be involved in a murder, the detective's Human friend Agatha Christie might write a story about the murder, and then we'd never hear the end of it. 
K-9 Mark 2: Given all that work, and the dangers involved, instead of giving the chocolate to a Human detective, we could just give it to K-9 Mark 1.
K-9 Mark 3: Once again, the wisdom of the K-9 series is demonstrated for all to see.