how long are dogs in season for

Dogs are generally in season (in heat) for about 2 to 3 weeks, though the duration can vary from as short as 2 weeks to as long as 4 weeks. During this time, the female dog is fertile and can become pregnant. The heat cycle has different phases, including proestrus and estrus, where physical and behavioral changes occur. Typically, dogs may have their first season around 6 months of age, and come into heat roughly twice a year, about every 6 months. The signs include vulva swelling, vaginal discharge, and changes in behavior. Once spayed, dogs no longer go into heat. This information summarizes the typical length and characteristics of being in season for female dogs based on multiple sources.