In medicine, etiology refers to the many factors coming together to cause an illness. It is normally the focus of epidemiological studies. The etiology of scurvy is a good example. With scurvy, sailors going to sea often lacked fresh vegetables.
So, how long are dogs pregnant? The answer varies depending on several factors, but the average length of gestation, aka pregnancy, lasts between 58 to 67 days, with 63 days being the average delivery date.
A female dog's pregnancy term is only around two months, with most dogs remaining pregnant for between 58 and 66 days. This relatively short gestation period can make it easy to miss some of the early signs of pregnancy.eterinarian Visit. If you suspect your dog is pregnant, make a veterinary appointment. Your veterinarian can tell you whether your dog is pregnant by conducting a physical examination. Beyond about 25 days into the pregnancy, your vet can listen to the puppies' heartbeats through a stethoscope.