When Does Your Dog Need Obedience Training? Pets, especially dogs, are great at relieving stress and anxiety. There’s nothing more comforting than coming home to see them wagging their tail in excitement, anticipating your return. However, if your dog holds their tail straight up, barks threateningly, growls, or lunges often, these could be signs of aggression. Behavioural problems can occur at any stage of life. They may cause ...