Resolving Fears, Phobias, and Anxieties: An Errorless Differential Reinforcement Approach is a manual for behaviorologists and animal behavior technologists in applying errorless differential added reinforcement to resolve escape-functional behavior in dogs (or other species). It provides a foundational treatment of basic principles of behavior and outlines the rationale for utilizing errorless differential reinforcement, particularly with DRO in the initial phase of the intervention, transitioning to DRI or DRA in later phases. It provides detailed instructions for applying errorless differential added reinforcement to actual cases. A companion book is available for guardians called Resolving Fears, Phobias, and Anxieties: A Guide for Dog Guardians.