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.
Confidence votes 3.8K. Pregnancy in a female dog lasts nine weeks. We determine the birthing date from the date of the first mating. Some bitches will whelp (deliver their puppies) anywhere from day 59 to day 63. As the owner, you will make no changes to her diet for the first 5 weeks. Often, in the 3rd week after mating, she will go off her food for about 10 days.