One of the most common phobias among dogs is noise phobia. Some dogs destroy windows, doors and wood fences while trying to escape during a thunder storm or 4th of July fireworks. Others "hide" for hours at a time. It is also common to see dogs that have an exaggerated fear of strangers (xenophobia) or an irrational fear of specific objects such as umbrellas, vacuum cleaners or even toys.
The symptoms of your dog's fears and phobias may also vary based upon your dog's temperaments and exactly what he is afraid of. Some of the most common behaviors that are associated with dog fears and phobias include digging, chewing, house soiling, hiding and clinging to the owner. The severity and intensity of such behaviors will usually depend upon the depth of the dog's fear and also the intensity of the trigger. For example, if a dog is afraid of loud noises then the loudness of the noise will often determine the intensity of the dog's reaction.
Some dogs may exhibit escape behaviors while trying to get away from loud noises while other dogs may become immobilized by their fears. In other cases dogs may attempt to hide from whatever it is that is triggering their fear. This can be particularly dangerous because the dog may become wedged in a tight place. In the case of a storm, the dog may begin exhibiting signs of fear even before the humans around him are aware that a storm is on the way.