Final answer:
The retractable leash is not a good choice for a fearful dog because it lacks control and can allow the dog to roam too far.
Step-by-step explanation:
The tool that is not a good choice for a fearful dog is the Retractable leash. Retractable leashes can be dangerous for fearful dogs because they allow the dog to roam too far and potentially get into situations that may trigger fear or anxiety. They also lack control and can enable dogs to pull too much, which can be overwhelming for a fearful dog.
Alternatively, a DAP diffuser, also known as a Dog Appeasing Pheromone diffuser, is a plug-in device that releases calming pheromones to help reduce anxiety in dogs. A Freedom harness is designed to give dogs more freedom of movement while still providing control over their behavior. And a Crate can provide a safe and secure space for a fearful dog to retreat to when feeling overwhelmed.