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Dog Pregnancy Calculator

Estimated Whelping Date:

Gestation Range:

Key Pregnancy Milestones:

  • • Heartbeat Detection: Around (Day 25)
  • • Skeleton Calcification: Around (Day 45)
  • • Prepare Whelping Box: By (Day 55)
function calculateDogPregnancy() { var dateInput = document.getElementById('matingDate').value; if (!dateInput) { alert("Please select a mating date."); return; } var matingDate = new Date(dateInput); if (isNaN(matingDate.getTime())) { alert("Invalid date selection."); return; } // Calculations based on average 63 days gestation var averageDays = 63; var minDays = 58; var maxDays = 68; var dueDate = new Date(matingDate.getTime()); dueDate.setDate(matingDate.getDate() + averageDays); var minDate = new Date(matingDate.getTime()); minDate.setDate(matingDate.getDate() + minDays); var maxDate = new Date(matingDate.getTime()); maxDate.setDate(matingDate.getDate() + maxDays); var heartbeat = new Date(matingDate.getTime()); heartbeat.setDate(matingDate.getDate() + 25); var skeleton = new Date(matingDate.getTime()); skeleton.setDate(matingDate.getDate() + 45); var whelpingBox = new Date(matingDate.getTime()); whelpingBox.setDate(matingDate.getDate() + 55); var options = { weekday: 'long', year: 'numeric', month: 'long', day: 'numeric' }; var shortOptions = { month: 'short', day: 'numeric', year: 'numeric' }; document.getElementById('dueDateDisplay').innerText = dueDate.toLocaleDateString(undefined, options); document.getElementById('dateRangeDisplay').innerText = minDate.toLocaleDateString(undefined, shortOptions) + " to " + maxDate.toLocaleDateString(undefined, shortOptions); document.getElementById('heartbeatDate').innerText = heartbeat.toLocaleDateString(undefined, shortOptions); document.getElementById('skeletonDate').innerText = skeleton.toLocaleDateString(undefined, shortOptions); document.getElementById('whelpingBoxDate').innerText = whelpingBox.toLocaleDateString(undefined, shortOptions); document.getElementById('pregnancyResults').style.display = 'block'; }

Understanding the Dog Gestation Period

A dog's pregnancy, or gestation period, typically lasts for approximately 63 days (about 9 weeks) from the date of ovulation. However, because the date of mating does not always align perfectly with the date of ovulation, a normal pregnancy can range anywhere from 58 to 68 days.

Stages of Canine Pregnancy

Knowing what to expect during each stage of your dog's pregnancy helps ensure a healthy delivery for the dam and her puppies.

  • First Trimester (Weeks 1-3): This is the period of fertilization and embryo movement into the uterus. You likely won't see physical changes, though some dogs experience "morning sickness" around week 3.
  • Second Trimester (Weeks 4-6): This is when the embryos develop into recognizable fetuses. A veterinarian can often feel the puppies via palpation around day 28-30. By week 6, the abdomen will noticeably enlarge.
  • Third Trimester (Weeks 7-9): Puppy development finishes. By day 45, skeletons are visible on X-rays. In the final week, the mother may become restless and begin "nesting" behavior.

Whelping Example Case Study

If your Golden Retriever was mated on January 1st, her estimated due date would be March 5th. You should have your whelping box ready by February 25th. Around March 3rd, you should begin taking her temperature twice daily; a drop below 99°F (37.2°C) usually indicates labor will begin within 24 hours.

Signs of Impending Labor

As the "Estimated Whelping Date" provided by the calculator approaches, watch for these signs:

  1. Loss of Appetite: Many dogs stop eating 12-24 hours before labor.
  2. Nesting: Shredding bedding or seeking a secluded area.
  3. Temperature Drop: A significant drop in rectal temperature.
  4. Restlessness: Shivering, panting, or pacing.

Disclaimer: This calculator provides estimates based on biological averages. Always consult with your veterinarian for professional prenatal care and to confirm pregnancy via ultrasound or blood test.

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