I've got some howlers here, obviously!
They don't howl at sirens or wolves on TV or anything, but I wish they would. I love howling. I hate barking. Bleh. Hear that, Cricket? You better learn to howl, boy!
I used to have a lot of audio clips of the dogs howling, but it looks like they got deleted. All I could find were these:
Oh, my dogs will howl upon hearing recordings of themselves. They howl when I play these.