It may be inclined to howl if other nearby dogs start barking and howling, or if it hears a certain high-pitched sound like a fire-engine drive by. [substeps] Try taking your dog to a dog park if it's not inclined to howl.
[header] How to teach your dog to howl [title] Wait for the dog to howl on its own. [step] It's tricky to make your dog howl before you've trained it. So, the first step is just waiting for the dog to howl.