Did you know that it’s not just humans that are affected by Seasonal Affective Disorder (SAD) in the dark winter months? Dogs can also be affected by this condition, and can exhibit symptoms such as frequent barking, less interest in activities such as going for walks or playing, aggressive behaviour, lethargy and reduced appetite. This is often caused by fewer daylight hours in the winter, which can disrupt melatonin and serotonin production in people and pets. Keep your dog active and engaged, and try to have him or her exposed to as much natural light as possible during the day.