Guinea Pig Pregnancy Calculator

A guinea pig pregnancy calculator converts a known mating date into an estimated delivery schedule. Guinea pigs, also called cavies, have a notably long gestation for small rodents. Most pregnancies last about 59 to 72 days, with many births occurring near day 65. This calculator uses 65 days as the central estimate for a sow that has previously delivered and 68 days as a cautious planning estimate for a first pregnancy. Those values are useful for preparation, but they cannot predict the exact day that labor will begin. Accurate records matter because guinea pigs can mate quickly and a date based only on observation may be uncertain. Record the day a sow was housed with a boar, the last possible mating date, her weight, appetite, and normal behavior. Weekly weighing at the same time of day can help reveal trends without excessive handling. Pregnancy should be confirmed by a veterinarian familiar with exotic mammals rather than by pressing or squeezing the abdomen, which can injure the sow or pups. During gestation, provide unlimited grass hay, fresh water, an appropriate measured pellet, and vitamin C from suitable foods or veterinarian-recommended supplementation. Avoid sudden diet changes. A pregnant sow needs a calm, clean enclosure with secure footing and enough room to move, but she should not be subjected to stressful introductions or unnecessary travel. After roughly day 45, monitor appetite, breathing, mobility, and behavior more closely and prepare clean bedding for the expected birth window. The normal range is broad because litter size, maternal age, genetics, health, and uncertainty about mating can shift delivery. First pregnancies deserve particular attention, especially when the sow is older than the ideal breeding age, because pelvic changes can raise the risk of difficult labor. Contact an exotic-animal veterinarian promptly for loss of appetite, bleeding, unusual discharge, marked lethargy, breathing difficulty, repeated straining, or labor that is not progressing. Do not use a calculated date to delay care. The displayed window is a planning guide rather than a diagnosis. If no pups arrive by the end of the likely range, seek veterinary advice to confirm whether the sow is pregnant and healthy. Used with careful records, appropriate nutrition, gentle observation, and professional care, the calculator helps owners and breeders organize monitoring while respecting the natural variation in cavy gestation.