Final answer:
The provided text does not mention Alexis, Mutt, or chocolate cake, and instead focuses on a character named Marcus who is feeding a dog named Alexander in a backyard scene.
Step-by-step explanation:
The text provided does not contain any information regarding Alexis, Mutt, or chocolate cake. The excerpt describes a scene where Marcus has made a kennel for Alexander, a dog, from an old water barrel, and is feeding the dog biscuits. The mention of McTeague suggests that the situation involves a consideration of what to do about Marcus's cousin, but this does not relate to the original question asked.