During the sixth week of puppy fetal gestation, the skin pigment is developed. The fetal heartbeat can be detected with a
stethoscope, and the fetuses should weigh approximately six grams and measure 45 millimeters in length. The pregnant
dog's nipples will enlarge and darken, and it's abdomen will continue to swell. Owners should begin giving the dog cottage
cheese or a hard boiled egg every day, and increase the dog's overall food intake. The expectant canine should also being
sleeping in its whelping (birthing) box.