Leaving home for a long time, you should leave your pet toys or tweeters for entertainment. You can leave the radio on so that the dog understands that he is not alone in the house. A prerequisite for calm behavior is an adequate supply of food and water and timely walking.
It is important to provide the four-legged pet with a walk and a level of physical activity appropriate for the breed. Be sure to teach the dog the commands "Voice!" and "Quiet". If you cannot eliminate the cause of the howling, you need to seek help from specialists - a veterinarian and a dog handler.