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.
Dogs can become pregnant until the end of the heat cycle, which can last up to 24 days. Do dogs go through menopause? No; female dogs continue to go into heat throughout their lives, although the length of time between heats usually increases with older age. What is the best way to control the heat cycle? The best way to control the heat cycle is to have your female dog spayed.