If the Dog Silencer MAX is close to the dog, you may be able to adjust the microphone sensitivity higher to pick up howling or even whining. If this doesn't work, you might consider our BarkWise no-shock training collars for your dog. Also keep in mind that a dog might be howling or whining for reasons such as discomfort, fear, or anxiety. These issues should be discussed with a veterinarian instead of “punished” with any bark control system.