Gestation Science & Safety
Canine pregnancy averages **63 days** from the ovulation date (ranges from 58 to 68 days). Feline pregnancy averages **65 days** (ranges from 58 to 67 days). Precise gestation timing is crucial because puppies or kittens delivered even 2–3 days prematurely suffer high mortality rates due to underdeveloped lungs.
During the final trimester (starting at week 6), caloric needs increase dramatically. The dam requires up to **25–50% more calories** than her normal adult baseline. High-quality, energy-dense growth/lactation food is highly recommended. Always verify litter sizes and fetal health with a veterinarian via ultrasound around day 25 or radiography after day 50.