Rusty Pup

Rusty Pup is the titular protagonist of The Unlikely Legend of Rusty Pup. He is a small wind-up toy dog, consisting of primarily a head, tail, and a singular wheel, and was created for Sam by her father out of ordinance scrap. He serves as her constant companion.

Rusty is notably afraid of the dark, and curious about strange smells. He also has no compunction eating brains, insomuch as a wind-up toy dog is capable of eating anything.