Dahlia is a light pink earth pony with white socks and a white belly. Her mane and tail are pale aqua green and her eyes are magenta. She wears a wine color scarf and a flower on her left ear. She has lavender eyes and gray-brown hooves.
At the end of Gonna Be My Day, when Sunny arrives at Canterlogic, Dahlia is seen at two places at the same time: talking with a grown up earth pony and in the background walking with a foal. That's probably because the animators used her model twice for the scene.