Cog is a helpful, kind, and caring puppy who admires Komodo since they look after each other. Like most of the Animal Mechanicals' pets, Cog can talk. He may be small, but he likes to think big like the Littlest Pet Shop Pets. Whenever Cog is not hanging out with the pets at Littlest Pet Shop or playing fetch with Komodo in the park, he sometimes helps Komodo with his studies or just building some new inventions.
Like Komodo, Cog is red and yellow and has blue glasses-like patterns around his eyes.