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.
Small breed dogs typically start having estrus (heat) cycles earlier, at 4-6 months of age, while large breeds typically start later, at 9 to sometimes as late as 24 months of age. Estrus cycles can vary between each individual dog, an average of 6 to 12 days. Some cycles can last as few as 2 days, while others can last as long as 21 days.1 Female dogs cycle throughout their life and do not experience menopause (reproductive cycles ceasing with age), like human females do. Learn more about: the canine estrus cycle.