Muffsies has a light orange shell with red spots, and is seen with bits of fabric around her shell. She has a light purple body that is teal colored at the bottom. She is seen with a diamond on the back of her shell, and she also has large eyelashes and black cornea/iris/pupil.
When Harrison put sunglasses around her eyes, she shook them off because she did not like them, so her owner put tiny ones on her that wouldn't slip off. When Gary told all the other pets what to do and they started to riot, Muffsies put the tiny sunglasses on Harrison's eyes, and he screamed.