This is another discussion that I see arise frequently. It is not uncommon for corgis to respond in an "excitable" fashion at some noises. Some dogs seem to be more sensitive or anxious to noises and will react by barking, nipping or biting at the object that disturbs them. Initially it is quite humorous but you will soon learn that the behavior increases with time. The reactivity may also start to include other noises. In time you will become very frustrated with this situation.
I have found with many dogs the best approach is to put them on lead when you are going to use whatever appliance seems to disturb them. If you have done your basic training the dog may still become anxious but maintain control much better. Any barking or attempts to get at the object should be redirected quickly. You may either call their name to have them look at you, have them sit or down. When they respond to you praise immediately and treat. This takes time, patience and practice but is well worth it.
Some do not seem to be bothered by this behavior but you need to know this behavior can also pose a danger to your dog. I have seen some try to attack lawn mowers and weed eaters. Surely a corgi is no match for either. This is one good reason to not allow your dog to respond in an exciteable fashion.
I have seen some dogs become reactive to noises such as the microwave beep, the timer on the stove, ringing phones, alarm clocks and noises on TV. Typically a dog that expresses this behavior either is a bit of an anxious dog or one that really needs more of an outlet for their energies.
The exciteability level can become very dangerous. Do know when dogs hit a certain level of excitement they lose control of their trained behaviors and seem to enter the zone of primal instincts. A dog in this state can react very negatively to those around them including other dogs, children and adults that try to interfere with their current "mission" One will often see this behavior with dogs that fence fight, dogs that may be playing and not uncommon at dog parks.
So a word for the wise, if your pup starts reacting to noises try to redirect that behavior now. I can assure you it will save you many problems later. For those of you that have adult dogs with this behavior start retraining now. This behavior is not only annoying but also can quickly increase and become dangerous. I always try to remind people that the time may come in your life that you are unable to keep your dog. Your chances of finding a home for a well behaved dog far out weigh placing one with behavior issues.