A disturbance in the associative thought process in which one tends to digress readily from one topic under discussion to other topics that arise in the course of associations; observed in bipolar disorder, schizophrenia, and certain types of organic brain disorders. Compare: circumstantiality.
The answer is simple, even if not actually correct. Pregnancies are considered full term at 40 weeks, and many women count four weeks as a month while they are pregnant, making the result a ten month pregnancy. On average there are actually 4.33 weeks in a month, however that a third of a week tends to get lost in the pregnancy shuffle for much of us. Many women also find it easier, when asked how pregnant they are, to answer in weeks instead of months, because pregnancy is generally a count down.
Gestation period is only 60-72 days, and the length of time to give birth depends on how many puppies she has and how fast they come. Asking how long it takes a female dog to give birth is as ludicrous as asking how long does it take a human to give birth? About 18-20 hours at the most.