Stress can cause health and behavioral problems in pets. Common causes of stress include unfamiliar places, rough handling, loud noises, and overcrowding. Signs of stress in animals include panting, salivating, inappropriate urination, shaking, hiding, and changes in appetite. The biggest source of stress for cats is unfriendly relationships with other cats, while dogs get stressed by other dogs barking excessively. To reduce stress from fireworks, pet owners should provide a safe hiding space, close windows/curtains, play music to mask sounds, and avoid reinforcing fearful behaviors.