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.
So, letâs talk a bit more about dog gestation periods and canine pregnancy in general. According to WebMD, dogs are pregnant for roughly 63 days, which is exactly 9 weeks. This is counted from the day the dog ovulates until the day she gives birth, and is split into three trimesters of roughly 21 days each.