Additionally, if left untreated, noise aversion can progress, resulting in an increased intensity of signs, aversion to other types of noises and / or development of other types of anxiety. (zoetisus.com)
Exposure to many different types of noises will help your pup learn that sound is not a scary thing. (allthingsdogblog.com)
The pitch of the noise can vary; there may be a single type of noise or a mix of two different components. (calmnatural.com)