Emily Elizabeth Howard (mentioned)
Dr. Dinn (mentioned)
Unknown female dog
Cleo, Mac, T-Bone and Clifford are playing ball in the park. Cleo says that she's got the ball, but then it ends up landing on T-Bone's head. Cleo apologizes; she was looking at another dog. More specifically, she was looking at what it's wearing. It has some sort of weird contraption that it's wearing instead of a normal collar. Clifford identifies it as a "cone collar." He says that if a dog has an itch that it can't stop scratching, the veterinarian will put on a cone so that the spot can heal without the dog continually scratching at it. Mac thinks that it's hideous. He figures it's the dog's own fault. If she had just been able to control her scratching, she wouldn't have to wear the cone. Clifford doesn't figure it works that way. If you have an itch, you scratch. Cleo agrees with Mac though and says she's glad that she'll never have to wear something like that because she can control herself. But can she? Throughout their playing, Cleo keeps stopping to scratch herself. It ends up interrupting a game of hide-and-seek. T-Bone finds Cleo, but she doesn't even notice because she's so busy scratching. She stops herself, saying that she can control. The other dogs aren't so sure though. They part ways for the day. The next day, Clifford and T-Bone head for Cleo's. Mac says that he's ready for some "serious digging." When they get to Cleo's, she doesn't want to come out of her doghouse. She makes up all sorts of excuses, but Clifford finally figures out why she doesn't want to come out. She's wearing a cone. It turns out she couldn't stop scratching, so Mrs. Diller took her to Dr. Dihn. She's happy now, she doesn't itch anymore. But she doesn't know how she's going to play with the cone on her. Clifford and T-Bone help her, showing her how she can have fun playing in different ways. Mac shows up. He's ready to taunt her about wearing the cone, but Cleo tells him off, explaining that she just couldn't stop scratching and that if he has a problem with that, he can play with someone else. This silences Mac, and then Cleo notices that he's scratching too. She figures this isn't a problem though: "You'll look great in a cone!".