The scale used to expose a dog to stimuli arranged from mild to intense is referred to as:

• A. Hierarchy of Intensity
• B. Gradient of Sound
• C. Series of Stimuli
• D. Hierarchy

Answer: (D)

The main idea here is a stimulus hierarchy—the organized, graded scale used to expose a dog to stimuli from mild to increasingly challenging. By starting with stimuli the dog can handle easily and rewarding calm or desired responses, you build confidence and tolerance. As the dog stays relaxed, you gradually move to more intense stimuli, ensuring mastery at each step before progressing. This approach prevents overwhelming the dog, reduces fear or avoidance, and promotes steady learning.

That’s why the best term is hierarchy: it explicitly signals an ordered sequence used for gradual exposure. The other options describe related ideas (a generic series of stimuli, or a gradient focused on one modality) but don’t capture the structured, progressive framework as precisely.