Enter a species and breeding date to get the due-date window and a pregnancy countdown — covering dogs, cats, cows, horses, sheep, goats, pigs, rabbits, and guinea pigs.
Approximate gestation ranges from veterinary references (see sources below). Shortest to longest average:
| Species | Range (days) | Average (days) | Offspring called |
|---|
A dog's gestation period is 58 to 68 days, with an average of 63 days. For example, a dog bred on Jan 1, 2026 has an estimated due window of Feb 28, 2026 to Mar 10, 2026 (most likely around Mar 5, 2026).
Because conception does not always happen on the breeding day — sperm can survive several days in dogs, and heat timing varies. Veterinary references therefore quote a range (for example, dogs 58 to 68 days, cats 63 to 67 days, horses 320 to 362 days). The window is the honest answer; the midpoint is the most likely single date.
Cattle gestation is 279 to 287 days, averaging about 283 days (roughly 9.3 months). A cow bred on Jan 1, 2026 has an estimated calving window of Oct 7, 2026 to Oct 15, 2026.
Mares carry foals for 320 to 362 days, averaging about 340 days (roughly 11 months). Horse gestation is one of the most variable among farm animals, which is why the window spans more than a month.
Cat gestation is 63 to 67 days, averaging about 65 days. Cats are induced ovulators, so their gestation varies less than dogs'.
Swine gestation is 112 to 120 days, averaging about 114 days — remembered as "3 months, 3 weeks, 3 days." A sow bred on Jan 1, 2026 has an estimated farrowing window of Apr 23, 2026 to May 1, 2026, most likely around Apr 25, 2026.
Rabbits have one of the shortest gestations of common livestock: 28 to 35 days, averaging about 31 days. Guinea pigs, surprisingly, are pregnant 59 to 72 days — longer than dogs — averaging about 68 days.
Sheep gestation is 142 to 152 days (average about 147), and goats 145 to 155 days (average about 150) — both roughly five months. Twins are common in both, and twins tend to arrive a few days earlier than singles.
If the due window's latest date passes without birth, contact a veterinarian — do not wait indefinitely. Overdue pregnancies can indicate dystocia or fetal problems. The calculator marks any pregnancy past its maximum gestation as OVERDUE for exactly this reason.
No. Gestation ranges are population averages from veterinary references; individuals vary. This tool is an estimate for planning only. For overdue pregnancies, labor problems, or any health concern, consult a veterinarian experienced with that species.
This hub covers nine species at a glance. For deeper single-species calculators — timelines, milestones, and checklists — see our dedicated tools: dog pregnancy, cat pregnancy, cow gestation, horse gestation, sheep gestation, goat gestation, swine gestation, rabbit gestation, and guinea pig pregnancy calculators.
Ranges used in this tool: dog 58–68, cat 63–67, cow 279–287, horse 320–362, sheep 142–152, goat 145–155, swine 112–120, rabbit 28–35, guinea pig 59–72.
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