Cleo is a female poodle who is purple in color who has a pink bow in the middle of her forhead. Energetic, selfish, spoiled, sassy troublemaker who sometimes doesn't tell the truth, but remains loyal to her friends.
Her catchphrase is "Have I ever steered you wrong?", which she inadvertently does immediately after saying this. After Cleo says that her friends usually says "well...yeah" and In make-believe games with Clifford and T-Bone, she portrays "the evil Fluffy-Face." She is one of Clifford's and T-Bone's best friends. Her human is Mrs. Diller. In the episode Friends Morning Noon and Night, it is shown Cleo has a lot of stuff including pictures of Mrs. Diller and some pictures of her self as a poodle.
Cleo can sometimes prove to be kinda pushy and sensitive. In the episode "Follow the leader", Cleo wouldn't give up being the leader to Clifford or T-Bone. She somes times can be difficult to handle, but her friends don't mind. Cleo has a tag in Clifford's Really Big Movie.