Dog Pregnancy Calculator
Estimate your dog's whelping (due) date based on the mating date and breed size. Track the stages of canine pregnancy week by week.
How It Works
Canine gestation averages approximately 63 days from the date of mating, though the normal range is 58-68 days. The variation depends on several factors including breed size, litter size, and the timing of ovulation relative to mating.
This calculator estimates the whelping date by adding the breed-adjusted gestation period to the mating date:
- Small breeds (under 20 lbs): Average 61 days, range 58-63 days
- Medium breeds (20-50 lbs): Average 63 days, range 60-65 days
- Large breeds (50-90 lbs): Average 63 days, range 61-66 days
- Giant breeds (over 90 lbs): Average 65 days, range 63-68 days
The calculator also shows the four main stages of canine pregnancy so you know what to expect at each phase: fertilization and implantation (days 1-21), early fetal development (days 22-35), fetal growth (days 36-49), and final development with nesting behavior (days 50-63+).
Important: For the most accurate due date prediction, consult your veterinarian. Progesterone testing and ultrasound provide more precise timing than the mating date alone.
Frequently Asked Questions
How long is a dog pregnant?
Dogs are typically pregnant for approximately 63 days (about 9 weeks) from the date of mating. However, the normal range is 58-68 days. Small breeds tend to have slightly shorter gestation periods (58-63 days), while giant breeds may carry for 63-68 days.
How can I confirm my dog is pregnant?
Your veterinarian can confirm pregnancy through several methods: palpation (feeling the abdomen) around days 28-35, ultrasound starting around day 25-28, a relaxin blood test after day 28, or X-rays after day 45 when the puppies' skeletons have calcified. An X-ray is also the best way to count the number of puppies.
What are the signs of dog labor?
Signs that labor is approaching include a drop in body temperature below 99°F (37.2°C) about 24 hours before delivery, restlessness and nesting behavior, loss of appetite, panting, and visible contractions. The first puppy usually arrives within 1-2 hours after active straining begins.
Does breed size affect gestation length?
Yes, breed size can slightly influence gestation length. Small breeds (under 20 lbs) tend to deliver on the earlier side of the range (58-63 days), while giant breeds (over 90 lbs) may carry closer to 63-68 days. However, individual variation is normal, and litter size also plays a role — larger litters sometimes arrive a day or two earlier.
What should I feed my pregnant dog?
During the first 4-5 weeks of pregnancy, maintain your dog's normal diet. Starting around week 5-6, gradually transition to a high-quality puppy food or a diet formulated for pregnant/nursing dogs. By the final weeks, increase food intake by 25-50%. Feed smaller, more frequent meals as the growing puppies take up abdominal space. Always ensure fresh water is available.
Medical Disclaimer
This calculator is for informational purposes only and is not a substitute for professional medical advice. Always consult your healthcare provider for medical decisions regarding your pregnancy.