This is Miso, a Chihuahua who is a music fan and loves to sing any chance he gets. Dogs are pack animals, and they like to participate in activities with their human family pack. When the harmonica started playing, the dog joined in the only way he knows how, by howling. Not all dogs will howl to every sound. Some get turned on by flutes, others by a saxophone, and others will start howling in response to your howling at them. And some don’t respond at all to music of any kind. A lot of dogs will cut loose when they hear a siren from an ambulance or fire engine. They are obviously communicating something to the siren. This is an instinctual behavior, and the dog thinks it is communicating with its pack.
Chihuahua Loves the Harmonica