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.
I've heard that dogs are pregnant for something like 2 months, but I'm not positive on that. Anyone that can verify how long dogs are pregnant for, or offer any other good advice regarding that, please do. You would definitly be helping out a lot of people. Dogs are pregnant for 53-56 days.