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Dog Pregnancy Calculator

Estimate your dog's whelping date. Enter the date of the first mating to see the projected 63-day due date.

Enter Mating Date

Your Dog's Due Date

Your dog's projected whelping date will appear here.

Understanding Your Dog's Pregnancy

A dog's pregnancy, or gestation period, lasts for about 9 weeks (63 days) on average. This can vary slightly, so it's common for dogs to give birth anywhere from 58 to 68 days after conception. Our calculator uses the 63-day mark as the most likely due date.

The "mating date" is not always the "conception date," as sperm can remain viable for several days. If your dog was mated multiple times, it's best to use the first mating date for this calculator and discuss any specifics with your veterinarian.

During this time, your dog's nutritional needs will change. You can use our future Dog Calorie Calculator to help manage her diet.

Dog Pregnancy Timeline: What to Expect

Here is a general week-by-week guide to what's happening during your dog's pregnancy:

  • Week 1-3 (Days 0-21): Fertilization and implantation. You may not see any signs of pregnancy.
  • Week 4 (Days 21-28): This is the best time for your vet to confirm the pregnancy, often via ultrasound or a blood test for the relaxin hormone.
  • Week 5-6 (Days 28-42): Physical changes may become more obvious. You might notice weight gain, a larger abdomen, and enlarged nipples.
  • Week 7 (Days 42-49): This is a key time for puppy development. Your vet may be able to take an X-ray to count the number of puppies in the litter.
  • Week 8 (Days 49-57): The puppies are almost fully developed. Your dog will likely show "nesting" behavior, looking for a quiet, safe place to give birth.
  • Week 9 (Days 58-68): Whelping is imminent. Your dog's body temperature will typically drop about 12-24 hours before labor begins.

How to Prepare for Whelping

As the due date approaches, it's important to be prepared. Set up a "whelping box" in a quiet, warm, and draft-free area of your home. This provides a safe and comfortable space for the mother and her new puppies. Line it with clean towels or blankets that can be easily changed.

Ensure you have your veterinarian's emergency contact information readily available. While most dogs give birth without complications, it's crucial to know who to call if you notice signs of distress. For more detailed information on whelping and puppy care, a great resource is the American Kennel Club (AKC) breeding section.