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Say “howl” when the dog howls. Reward the dog with a treat each time you say “howl. Provide a nonverbal cue if you want your dog to respond to a signal. Wean the dog off of the treats.
Once you’ve figured out a way to make your dog howl, you need to start using the command that you’d like to induce the dog to howl. Whenever you play a sound that makes your dog howl, approach the howling dog and say, “howl!” If the dog’s howl is very loud, raise your voice so the dog can hear you over its own howl.  Give your dog time to link the “howl” command and the howling behavior. It may take a few weeks for the dog to be fully trained to howl. If you prefer, you could say “sing” instead. Just be sure that you’re consistent with the command you give the dog. ” The two can be done simultaneously. Once the dog begins to howl, say “howl” (or “sing”) in a firm tone. Then give the dog a treat. This will reinforce the howling behavior, and teach the dog to associate the behavior with your command.  Continue to reinforce the howling behavior over a period of days (or weeks). During this stage of the training, you may still need to occasionally stimulate the dog to howl by using music, a YouTube video, or your own voice. Be specific with the behaviors that you reinforce. A howl is different than a bark or a yip, and so the dog shouldn’t be given a treat for barking when you want it to howl. Train the dog to respond to a different cue instead. If you’d rather not give the “howl” command, try using another cue. Some dog owners may prefer to train their dog to howl when given a nonverbal cue. The process is identical to training the dog to howl to the “howl” command, but you’ll use the nonverbal cue in conjunction with the dog treat. For example, you could train the dog to howl to the sound of a certain piano note or to howl every time you clap your hands or snap your fingers. Once your dog has come to understand the connection between hearing the “howl” command and howling, you can begin to cut back on the number of treats it receives. For example, still give the “howl” command but only give a treat half the time. A few days later, cut back to only giving a treat a quarter of the time. Then, cut out the treats altogether.  If you like the idea of giving your dog a treat each time it howls on command, you can skip this step. Use the “quiet” command and reward your dog when it stops howling. This can help you control the amount of noise they make later on.