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.
One of the most common questions when Precious reports for her morning meal having had absconded with Jo-Jo from down the street the night before, is how long is a dog pregnant? There is a short answer to this and a long answer to this. Generally speaking, a dog is pregnant in the vicinity of 62 days.