Pet Pregnancy Calculator

The average dog pregnancy (gestation) is 63 days from ovulation, but can range from 58-68 days depending on breed size. Small breeds like Chihuahuas often deliver slightly earlier (around 61 days), while giant breeds like Great Danes may go to 65+ days. Our calculator adjusts for breed size automatically.

Cat pregnancy typically lasts 63-65 days from conception. Unlike dogs, there's less variation between breeds. The range is 58-70 days, but delivery before day 58 is considered premature. Signs of imminent labor include nesting, restlessness, and temperature drop.

A vet can confirm pregnancy via ultrasound around day 25-30 after mating. Heartbeats become detectable around day 28. For an accurate puppy/kitten count, an X-ray at day 45-50 is more reliable since skeletons are visible by then.

Early signs (weeks 3-4) include: nipple enlargement and pinking ('pinking up'), decreased appetite or morning sickness, increased affection, and slight abdominal thickening. Many pets show no obvious signs until week 5-6 when the belly visibly grows.

Enter your mating date and select the species. The timeline shows 9 key stages from fertilization to birth with specific dates. Milestones that have passed appear faded. Each milestone includes what's happening developmentally and what care may be needed.

Nutrition needs change by trimester: Early (weeks 1-3) - maintain normal diet, avoid overfeeding. Mid (weeks 4-6) - increase food by 25%, consider switching to puppy/kitten food for extra calories. Late (weeks 7-9) - increase by 50%, feed smaller, more frequent meals as the belly limits capacity.

About 24 hours before labor, body temperature drops by about 1°F (0.5°C) - from normal 101-102°F to 98-99°F in dogs. This is a reliable sign that labor will begin within a day. Start taking temperatures twice daily in the final week.

A whelping box (dogs) or queening box (cats) is a clean, enclosed space for giving birth. It should have low sides for mom to enter easily, high enough to keep puppies/kittens contained, absorbent bedding, and be placed in a quiet, warm area. Introduce it 1-2 weeks before the due date.

We recommend 3 checkups: Day 25-30 for pregnancy confirmation (ultrasound), Day 35 for heartbeat check and fetal count, and Day 45-50 for optional X-ray to count puppies/kittens precisely. Additional visits if there are any concerns or complications.

Smaller dog breeds tend to deliver 1-2 days earlier than the 63-day average, while giant breeds often go 2-3 days longer. This is due to differences in litter size and fetal development rates. Our calculator adjusts automatically when you select breed size.

Due dates are estimates based on average gestation periods. We show a window range (e.g., ±3-5 days) because actual delivery can vary. Factors affecting timing include breed, litter size, first-time vs experienced mothers, and individual variation. Always be prepared a week before the earliest date.

We support 11 species: Dogs (63 days), Cats (65), Rabbits (31), Guinea Pigs (65), Hamsters (16), Ferrets (42), Horses (340), Goats (150), Sheep (147), Pigs (114), and Cows (283 days). Each has species-specific margin windows and milestone timelines.

Yes! Click Print for a popup window with a clean, printer-friendly guide showing your due date, milestone timeline, and vet checkup schedule. Click Download to save a text file with all details - useful for sharing with your vet or family.

If delivery hasn't started by the maximum due date (end of the window range), contact your vet. For dogs, going more than 68 days can indicate issues. Watch for signs of distress: straining for more than 30 minutes without producing a puppy/kitten, green/black discharge without delivery, or lethargy.

Warning signs requiring immediate vet attention: more than 2 hours between deliveries, straining for 30+ minutes with no progress, bloody discharge before any births, extreme lethargy, vomiting or refusal to eat, temperature above 103°F, or green/black discharge before the first birth.