A dog pregnancy calculator helps breeders and pet owners determine their dog's estimated due date and track week-by-week development milestones throughout the 63-day canine gestation period. Knowing where your dog is in her pregnancy helps you schedule vet visits, adjust nutrition, and prepare a safe whelping area for delivery day.
Enter Breeding Information
Enter the date your dog was bred. Conception typically occurs within 24-48 hours.
Conception typically occurs around day 11 of the heat cycle. We will add 11 days to estimate the breeding date.
Estimated Due Date
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Current Day
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Days Remaining
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Current Week
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Possible delivery window: -- to -- (Day 58-68)
Gestation Progress
Week-by-Week Pregnancy Timeline
Your current week is highlighted. Each week shows key development milestones and care tips.
Temperature Monitoring
Normal temperature: 101 - 102.5°F (38.3 - 39.2°C)
Take your dog's rectal temperature twice daily during the final week
Labor signal: Temperature drops below 100°F (37.8°C)
Labor typically begins within 12-24 hours of the temperature drop
Whelping Preparation Checklist
Start preparing by Week 7. Check off items as you gather them.
How to Use the Dog Pregnancy Calculator
Tracking your dog's pregnancy is essential for ensuring the health of both the mother and her puppies. This free dog pregnancy calculator helps breeders and pet owners determine the estimated whelping date, monitor week-by-week development, and prepare everything needed for a safe delivery. Whether this is your first time breeding or you are an experienced breeder, having a clear timeline makes the entire 63-day gestation period more manageable.
Step 1: Enter Your Dog's Breeding Date
Select whether you know the exact breeding date or only the first day of heat. If you know when your dog was mated, enter that date directly. The calculator uses this as the conception date since fertilization typically occurs within 24 to 48 hours of mating. If you only know the first day of heat, the calculator adds 11 days to estimate the likely conception date, since most dogs ovulate and conceive around day 11 of their heat cycle.
Step 2: Review the Due Date and Progress
After clicking Calculate, you will see the estimated due date based on the standard 63-day canine gestation period. The results also show which day of pregnancy your dog is on, how many days remain, and a delivery window spanning day 58 to day 68. This range is important because healthy puppies can arrive anywhere within this window. The progress bar gives you a visual snapshot of how far along the pregnancy is.
Step 3: Follow the Week-by-Week Timeline
The pregnancy timeline breaks down all nine weeks of canine gestation into clear developmental stages. Each week shows what is happening with the developing puppies, from fertilization and implantation in week one through to labor readiness in week nine. The current week is highlighted so you can quickly see what stage your dog is at and what to expect next. Key care instructions like diet changes, vet visits, and exercise adjustments are included for each stage.
Step 4: Monitor Temperature and Prepare for Whelping
During the final week of pregnancy, begin monitoring your dog's rectal temperature twice daily. A normal temperature is 101 to 102.5 degrees Fahrenheit. When the temperature drops below 100 degrees, labor typically begins within 12 to 24 hours. The whelping preparation checklist helps you gather all necessary supplies in advance, from a whelping box and clean towels to your veterinarian's emergency contact information. Being prepared reduces stress for both you and your dog when the big day arrives.
Step 5: Know When to Call the Vet
While most dog pregnancies proceed normally, some situations require immediate veterinary attention. Contact your vet if your dog is in active labor for more than two hours without delivering a puppy, if there is heavy bleeding or foul-smelling discharge, or if the pregnancy extends beyond day 68. Schedule a confirmation ultrasound around day 25 to 30 and an X-ray around day 45 to count the expected number of puppies. This calculator is a helpful planning tool, but it does not replace professional veterinary care.
Frequently Asked Questions
Is this dog pregnancy calculator free to use?
Yes, the Dog Pregnancy Calculator is completely free with no limits. You can calculate due dates and track pregnancy milestones as many times as you need. There is no signup required, no premium tier, and everything runs locally in your browser.
Is my data safe and private?
Yes, everything runs entirely in your browser using client-side JavaScript. No dates or information are sent to any server. Once you close the page, there is no record of the data you entered. Your breeding records stay completely private.
How long is a dog pregnant?
The average canine gestation period is 63 days from conception, though normal pregnancies can range from 58 to 68 days. Smaller breeds may deliver a few days earlier, while larger breeds sometimes go a day or two longer. If your dog goes beyond 68 days without signs of labor, contact your veterinarian immediately.
How do I know when my dog conceived?
If you know the exact breeding date, conception typically occurs within 24 to 48 hours of mating. If you only know the first day of heat, conception usually happens around day 11 of the heat cycle. This calculator supports both input methods so you can estimate the due date either way.
What are the signs a dog is about to go into labor?
Key signs include a drop in body temperature below 100 degrees Fahrenheit (normal is 101 to 102.5), restlessness, nesting behavior, loss of appetite, and panting. The temperature drop typically occurs 12 to 24 hours before labor begins. Start monitoring your dog's temperature twice daily during the final week of pregnancy.
When should I take my pregnant dog to the vet?
Schedule a vet visit to confirm pregnancy around day 25 to 30, when an ultrasound can detect heartbeats. A second visit around day 45 for X-rays can reveal the number of puppies. Contact your vet immediately if you notice discharge, lethargy, vomiting, or if labor stalls for more than two hours between puppies.
What should I feed my pregnant dog?
During the first four weeks, maintain your dog's regular diet. Starting around week five, gradually increase food by 10 to 25 percent. By week six, switch to a high-quality puppy food, which has the extra calories and nutrients needed for the developing puppies. Feed smaller, more frequent meals as the belly grows and stomach capacity decreases.
Can I use this calculator for any dog breed?
Yes, the 63-day gestation period applies to all dog breeds, from Chihuahuas to Great Danes. While the pregnancy timeline is the same across breeds, litter sizes and puppy development rates can vary. The week-by-week milestones and whelping preparation checklist in this calculator are universal for all breeds.