To calculate the exact lap day for dogs, you need to track the gestation period, which typically lasts around 63 days from conception. Using a dog lay day calculator can simplify this process by giving you an accurate due date. Make sure to monitor any early signs of pregnancy in your dog for more precise calculations. This tool is handy for both breeders and pet owners who want to be well-prepared. Don't forget to consult a vet for confirmation!