Dogs love a good Diva.
Ever notice that when a dog howls it has a high pitch quality and it seems like they're trying to hold a certain note. A lot of music also shares that quality, specifically pieces that involve pianos, saxophones and clarinets are songs that make dogs howl. High female singing can also encourage doggie howling. If your dog howls when he hears music with any of these elements, it may be because he -- mistakenly -- thinks that he is hearing another dog somewhere off in the distance calling out to him, and is attempting to acknowledge the communication by answering back loudly. "Low" instruments, such as bass guitars, can't confuse canines in the same manner -- they sound nothing like canine howling.
Here are a few dogs singing along to their favorite songs.