How long is a jack russel pregnat for?
Pregnancy in the dog (all breeds) lasts about 2 months: 60-64 days. The canine reproductive life varies greatly from breed to breed with regard to onset of puberty, however. Small breed dogs typically start having estrus (heat) cycles earlier, at 4-6 months of age, and large breeds typically start later, at 12 to 24 months of age. The estrus cycles vary between each individual dog, average of 7 to 10 days. Some dogs as few as 2 days, some dogs cycle as long as 21 days.* Female dogs cycle throughout their life, they do not experience menopause (reproductive cycles ceasing with age) as human females do. Female dogs that are spayed eliminate the chance of uterine infection (a condition called pyometra), uterine cancer, and ovarian cancer, since the uterus and ovaries are removed during the spay surgery.
