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.
Could puppies be in your petâs future? Dogs are pregnant for about 63 days, which is measured from the day that they ovulate (release their eggs) to the day that their puppies are born. Like people, dogs are pregnant for three trimesters, each about 21 days long. Here are a few ways to tell if your dog is pregnant: