Hound is the Penderwick's large black dog. He is very energetic and Batty's best friend. As of the third book, he is six years old, a year older than Batty. Hound loves to chase squirrels and is friends with Asimov the cat. He often eats things he isn't supposed to eat.
Hound dies after the third book, but before the fourth book. He gets sick and Batty blames herself for his death, even though it isn't her fault. The other Penderwicks are also sad about his death, but Batty is the most devastated.