When a dog fears noise he or she can respond to this fear in a number of different ways. The dog may begin to shake and tremble, the dog may bark excessively, the dog may hide and refuse to come out, and in some cases the dog may urinate in the home out of extreme fear. A sudden loud noise can frighten even the most secure and happy dog, but a continual fear of noises can decrease the quality of life that a dog is able to experience.