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.
In answering âhow long are dogs pregnant,â itâs important to remember that, for larger dogs especially, the swollen abdomen that we notice in humans might not present until the last three weeks of pregnancy. For the first couple of weeks of a dogâs pregnancy, she may lose her appetite and become lethargic.