spiritdogs
Posted : 4/6/2010 7:12:38 PM
Another possibility, other than the previously mentioned seizure activity (some dogs are triggered by the flashes of light from TV's), is that he is annoyed by the noise (have his ears checked for hearing and for infection), and somehow made an association that the other dog is the cause of it. So, when the noise goes off, he attacks the other dog to try to make it stop.