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.
When planning to breed your dog, you need to know the length of the gestation period in dogs. Knowing how long your dog is pregnant for will help you plan for things like veterinary checkups, emergencies, and most exciting, whelping. Dogs are pregnant for approximately 63 days, or about two months.