Jerry Mouse Jr. is a short anthropomorphic mouse with light brown fur, a tan belly, a tan snout with a black nose, white and black eyes, a clump of hair, and wears a trademark red bowtie. In some appearances, he wears clothing during particular events. He and Tom also appear in some segments based upon historical events, but that it's rather their imagination, since they live in a more modern world. During most of his appearances, he often gets chased by Tom, and usually retaliates Tom's plans, although Tom and many cats and humans claim that he is a pest.