at what age do dogs start heat
Some owners may be surprised to know that a female Boxer can enter heat relatively early. Boxer dogs typically enter the first heat between the ages of 6 months old and 1 year old. However, some may have it as early as 4 months or as late as 15 months old. If your un-spayed female does not have her first heat by the age of 2 years old, you'll want to alert the veterinarian. Since the heat cycle will occur when a Boxer is still a puppy, this means that he is able to become pregnant at that young age.