NEW YORK, NY - AUGUST 15: White House Chief of Staff Gen. John Kelly looks on as US President Donald Trump speaks following a meeting on infrastructure at... Drew Angerer The disconnect between the White Houseâs John Kelly and his boss
While many females will hold to a fairly steady schedule of coming into season about every six months, it can vary. Some girls will only come into heat once year, while others may even come into season every four months. However, these extra seasons are not always fertile.
Answer Wiki. Female dogs are usually pregnant for 9 weeks, varying from 60-67 days. It is sometimes difficult to determine exactly when a bitch is due to whelp because matings may occur over many days during the estrus cycle. This affects when puppies are born rather than the breed, as there are few differences in gestation length regardless of breed.