The shedding season for dogs usually occurs twice a year, primarily in the spring and fall. In the spring, dogs shed their heavier winter coat to prepare for warmer weather, typically starting around March and finishing by June for outdoor dogs. In the fall, they shed their lighter summer coat to grow a thicker coat for winter, with shedding commonly starting around September and finishing by November. Indoor dogs may shed more moderately throughout the year due to artificial lighting and climate control disrupting their natural cycle. The exact timing can vary depending on breed, age, sex, living environment, and health. Double-coated breeds like Siberian Huskies or Golden Retrievers often have more pronounced shedding seasons. For many dogs, shedding can last 6-8 weeks during these peak times, and it is triggered by changes in daylight and temperature.