---

About this Tool

This calculator estimates a dog's whelping date based on the average gestation period.

How Long is a Dog Pregnant?

The average gestation period for dogs is **63 days** from the date of mating. This is the date used to calculate the primary due date.

However, the gestation period can range from **57 to 65 days**. Our calculator provides this full date range to give you a clearer window for when to expect the puppies.

Signs of Dog Pregnancy

While this calculator provides an estimate, only a veterinarian can confirm pregnancy. Common signs to look for include:

• Increased appetite
• Swollen belly or weight gain
• Increased nipple size
• More easily tired or more affectionate behavior

A veterinarian can use several methods to confirm pregnancy, such as a hormone test, ultrasound, or X-rays (later in the pregnancy).