Desensitization is a behavior modification technique in which you purposely and gradually expose your pet to a stimulus that has triggered a fear response. The stimulus is always controlled, starting at a very low level, so that your pet does not experience fear or display signs of stress. Over several sessions, you gradually increase the intensity of the stimulus, as long as there is no sign of fear. Manage the distance from the trigger, beginning far away and gradually getting closer. If the trigger is a noise, adjust the volume, going from low to high. If the trigger is a moving object, such as a bicycle, change the speed at which it moves, working from slow to fast. Break the trigger up into components: Some triggers are composed of multiple parts, such as sound, motion, sight, and smell. For example, if your pet is afraid of the vacuum cleaner, begin with the vacuum turned off and stationary. Counterconditioning is a behavior modification technique in which you pair something that causes a negative emotional response with something known to create a positive emotional response in your pet. Tasty food treats are commonly used to create a positive emotional state. Desensitization and counterconditioning are often used together when treating fearful pets.