Double Beat is a grey robotic dog with four small, dark pink legs, and dark pink bolts on both sides of her jaws. She has yellow tinted eyes, a spherical purple nose, long purple ears, and a long purple tail, along with sharp metal teeth connected to her large jaw. Her body is composed of many small metal parts put together with visible screws.
She seems to be quiet, obedient, and calm. She takes care of the "attack" button when Lord Boxman asks her to, so he's not tempted to press it. She's also seen next to her food bowl while the family is having dinner.