Sweet Heart Mouse is one of the Care Bear Cousins appearing in The Care Bears Family. She is the sunniest, sweetest and cheerful of the Care Bear Cousins. She is Treat Heart Pig's Best Friend. She is a sunflower yellow mouse with bangs and a pink hairbow on her head and her belly badge is a cupcake with light pink icing, rainbow sprinkles and a red heart on top. She appeared in The Care Bears Family episodes. She also helps other kids. She is voiced by Jen Tolley.