Bernese Mountain Dogs need a great deal of companionship and do not like being left alone for more than a few hours. They tend to express their unhappiness through destructive chewing. Providing enough socialization. Answered By: Anais Waters. Date created: Fri, Mar 5, 2021 7:20 PM. FAQ. =I Are air diffusers bad for dogs? Many essential oils, such as eucalyptus oil, tea tree oil, cinnamon, citrus, peppermint, pine, wintergreen, and ylang ylang are straight up toxic to pets. These are ...