Use our free Pregnancy Due Date Calculator for pets. Pick species and enter the mating/conception date to get the expected due date, an earliest–latest window, and a quick gestation progress overview. Works great for both dogs and cats.
Pet Pregnancy Due Date (Dog & Cat)
Dates update instantly. If you don’t know ovulation timing, leave it unchecked and use the breeding date.
- Dogs: average 63 days from ovulation; when using breeding date, whelping is commonly seen between 58–68 days.
- Cats: average ~65 days; practical range is about 63–67 days.
- Real timing varies with ovulation day, litter size, health, and breed. Always consult your veterinarian.
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Understanding Pet Pregnancy Timing
Estimating a reliable due date helps you prepare a safe whelping or queening area, plan veterinary checks, and avoid last-minute stress. For dogs, the most accurate prediction comes from progesterone testing: veterinary guidelines typically count 63 days from ovulation. When only the breeding date is known, most litters arrive between 58 and 68 days after mating, because fertilization may occur several days after the initial tie. In cats, gestation averages about 65 days and most queens deliver within 63–67 days. These ranges reflect normal biological variability.
How This Calculator Works
Select your species and enter the mating/conception date. If you have a confirmed ovulation or progesterone date for a dog, enable the toggle to calculate 63 days from ovulation. Otherwise, the tool provides an average date plus an earliest–latest window (e.g., 58–68 days in dogs, 63–67 days in cats). We also show gestation progress so you can see how many days have passed, roughly how many remain, and which week you are in.
Why Dates Can Shift
Several factors influence timing: the actual day of ovulation, breed and litter size (large litters may come earlier), maternal health and age, and environmental stress. Because of this natural variation, a window is more practical than a single fixed day. Keep your veterinarian informed—especially if you expect complications or if there are no signs of labor beyond the window.
Trusted Reading
For dog pregnancy timelines and whelping preparation, see the American Kennel Club (AKC). For feline reproduction and queening care, the Cornell Feline Health Center is an excellent resource. Clinical summaries on normal and abnormal gestation can be found in the Merck Veterinary Manual. You can also review practical owner guidance on timing and labor signs at PetMD.
Care Tips as the Date Approaches
- Monitor appetite, temperature, and behavior; a drop in rectal temperature (to ~99°F/37.2°C) often precedes canine whelping.
- Prepare a clean, quiet whelping/queening area with washable bedding and a safe heat source for neonates.
- Discuss emergency plans with your veterinarian—especially for brachycephalic breeds or if previous deliveries needed assistance.
Use this calculator as a planning guide, not a substitute for veterinary care. If you notice signs of distress, prolonged labor without progress, or if the due-window passes with no activity, contact your veterinarian promptly.