The more babies a woman is carrying, the more likely it is that her uterus will swell, triggering contractions, says Brian Brost, M.D., associate professor of maternal/fetal medicine at the Mayo Clinic, in Rochester, Minnesota. An early due date isn't the only challenge to having multiples.
Dogs do not menstruate like humans do. Instead, they come into estrus (come into heat/season) about twice a year, once they have reached sexual maturity. This can sometimes be associated with a small amount of blood from the vulva, but it is not truly a period. Female puppies can reach sexual maturity potentially as early as six months old, although the first season (which is the closest equivalent to getting their period) is often at about nine months old.
If youâve adopted an adolescent dog, congratulations! The world needs more people like you. Or, if you started out with a puppy and are ready to brave the teen months, congratulations! The world needs more people like you. The adolescent period starts at around six months for small dogs and nine to twelve months for big dogs. It lasts til age 18 months to two years. Itâs when pups start realizing there is a world beyond you, their much-adored Favorite Person.