A frightened dog cartoon usually shows the dog with wide eyes, raised fur, and a hunched posture. Maybe it's also shaking or hiding.
Well, usually a frightened cat cartoon shows the cat with wide eyes, arched back, and maybe its fur standing up.
A frightened man in a cartoon usually has wide eyes, a pale face, and maybe a shaky body.
Maybe he saw something scary. That could be a monster or a sudden loud noise.
Typically, a frightened woman in cartoons could have a shrill scream or gasp. Her expression would be one of terror, with eyebrows raised and mouth open. Also, she might run or hide to show her fear.
Well, usually a frightened cartoon character shows exaggerated expressions like a big open mouth, and they might run around frantically. Also, their hands might be up in a defensive position.
They often show cars with scared expressions and in dangerous or mysterious situations. The colors might be darker to create a tense atmosphere.
It's possible that the kid was frightened in the cartoon class because of a scary story told by the teacher or a strange shadow they saw. Maybe they had a bad dream earlier and were still feeling scared.
You can start by sketching the basic shape of the wolf's body. Then, focus on the facial expression to show fear - wide eyes, arched eyebrows, and a slightly open mouth. Add some shivering lines to the body for effect.
Well, these cartoons might have cute and funny depictions of dogs. Maybe they show the dogs having adventures or doing silly things.
Maybe she's not used to riding it or saw something scary on the trail.